It doesn't matter what setting you choose, you can be home in bed or parked on your town's main street, just find whatever level of privacy you need to feel relaxed. For the purpose of these lessons let's say you're still on the bed where you were examining him and you managed to get his cock hard. Kneel down between his legs and take his balls in your left hand and his cock in your right. Squeeze his cock gently down toward the bottom of the shaft and get ready to suck. Run your tongue over your lips to get them good and wet and look into his eyes. Men love to watch their cock disappearing into a woman. 
Now open your mouth just slightly to tease and excite him and come very close to his cock. Breathe on him, blow on him with your hot breath. Stick your tongue out again and reach for him, tease him. Making sure your tongue is dripping wet, begin at the bottom of his shaft and lick upwards, slowly. Turn your head sideways and pretend to take a bite of him, gently setting your teeth into his flesh. Wet him again with your tongue, use your hand to spread the liquid around. A wet cock looks and sounds a lot sexier than a dry one. Your left-hand meanwhile is massaging his balls, perhaps scratching them lightly with your fingernails. After you've licked his shaft lots of times and it's all wet and hard, he's going to start squirming with frustration if you don't start getting serious. A quick look up at his face will let you know when you're stretching things out too long. Teasing is great . . . to a point. A little experience in cock-sucking will teach you when you need to go on to better things. 
On one of your upward swings with your tongue, from the base of his shaft to the rim of his knob, don't stop. Continue your long, wet lick up over the head of his cock, lingering at the hole in the center. Stick your tongue into it, but don't suck the head yet. Now run your tongue all the way around the rim of his knob several times, lingering to work on that sensitive spot on the bottom each time. Ask questions, find out how much he likes for you to work on that spot. 
As I said earlier, the shaft of his cock does respond to pressure, and there are a lot of nerve endings when you include all of it. Don't forget that much of the pleasure we derive from sex is in the mind, it's psychological, emotional. When a man feels your warm soft mouth and tongue giving his cock a workout, feels you trying to suck his balls out through it, sees your lips sliding down over it until it fills your mouth, the overall feeling is hard to describe. When you take all of this into account, the deeper the better girls. 
Each man is unique and so is his cock. Squeeze the shaft and see if some clear liquid pops up. If it does, dip your tongue into it and pull away. It will stretch with you and look fantastically erotic to him. Now, make like you love the stuff. Close in on that cock head like it was a chocolate ice-cream cone and take the whole knob into your hot mouth. Don't just open your mouth and close it around his cock, sliiide your wet lips down over it until they close around the shaft just behind the corona. Then gently suck on his cock just hard enough to pull a little more of it into your mouth. Sucking on it feels great to him, hold it there, listen to him moan. Now, move your head down quickly, sucking as much of his cock into your mouth as you can comfortable take. Don't worry, you won't choke so long as you don't try to take it in too far, we'll get to suppressing your gag reflex so you can take more of it in later. Encase the rest of the shaft of his cock with your hand. Remember the shaft is relatively insensitive to local stimulation. However, when you close your hand around his cock you give him the sensation of having his whole cock encased and that feels great. 
Stay there with his cock filling your mouth. Feel it inside of you. When you get to where you can take it down into your throat, it can be almost as luscious as having one in your cunt. It grows in, uh, on you. 
You're going to have to keep your jaws open wide enough to keep your teeth off his cock. When you first start out your jaws are probably going to get tired, it's sort of like sitting in a dentist's chair with your mouth open. You'll get used to it after a while. You can pull your lips back over your teeth for protection and let your jaws rest on his cock from time to time to relax them. 
Now try the basic fellatio movements. First, slide your lips back up to the tip of his cock and flick your tongue against it. Try twisting your head from side to side, up and down, and around and around, making sure your moist lips stay in contact with his ridge as they slide around. Keep sucking on it, sometimes gently, sometimes hard. While you're doing this, gently move your moist hand up and down the shaft. He'll be getting antsy now, wanting you to take it all in. Don't let him, if he had his way it'd be over in two minutes and what fun would that be? 
Then, moving as fast as he can handle it (don't let him cum yet), hold your hand against your lips and slide your mouth and moist hand up and down on his cock as if you're fucking him. Press your tongue against the bottom of his cock and let it's head slide back and forth between your tongue and the roof of your mouth, watch your teeth. You have to massage the head of his cock, not just the shaft. When he gets close to cuming, get ready for his climax. As he nears his climax, he may try to slide your mouth farther down over his cock. He wants all of his cock in your mouth. Instead, slide your mouth back up to the tip of his cock, working on the corona and sucking on it as you bring him to his climax. You need to feel the response of his cock to his climax in these early lessons. 
We've been talking about sucking on his cock, but how do you suck on it? Besides just working on his cock with your lips and tongue when it's in your mouth, you should also be sucking on it any time its head is in front of your tongue (your tongue is what pulls the vacuum so its head has to be in front of your tongue for him to feel it where it counts). Sucking on the head of his cock feels quite different to him from licking it. Not just gentle sucks but strong ones, like you were trying to get something out of it, which you probably are by this time. Be careful though, don't pull a hickey on it. There are deep-sucks and little ones and both feel damn great. He may have a preference however, so watch his reactions. Taking just the knob in your mouth, suck on it as if it were a nipple or a straw while you're moving your mouth around the head with your lips massaging the coronal ridge. This feels so good to the man, it makes my cunt hot just thinking about it. The other suck is a long, sweeping one, where you suck his cock into your mouth as far as you can, and then pull your mouth back off it, sucking on it as if you were sucking the juice off a popsicle. 
Any of these moves will feel great the first few times you do them, but after a while, it's as if the cock gets immune to feeling. When you sense this, change what you're doing. You don't want his cock to go to sleep. You want it constantly stimulated as you build him up to orgasm. Which is just about where we are now. 
Okay, you've got a raging hard-on in your right hand and some tight balls in your left, lean back for just a moment and take a look at it. It's beautiful, isn't it? Move your right hand all the way to the base of the cock and squeeze it there. This will cause the shaft to fill and thicken, and by now the knob will be smooth and shining. Take his cock back into your mouth, sucking on it and trying out all your various moves until you know the man can't stand any more and he's going to blast off. What you do now is between you and your lover. 
As you continue with these lessons, don't forget that sucking his cock should give you pleasure also, don't do it just because he wants you to. It's very important that your man take the time for enough foreplay to get you to the point where you want his cock in you. You'll learn to savor the sensations that come with having his cock in your mouth and throat, you'll enjoy bringing intense pleasure to him and sharing in his climax. As you continue with these lessons, don't get so caught up in the mechanics of bringing him to climax that you miss out on the fun. Suck his cock in a way that feels good to you also. There's no blowjob like a blowjob given by a happy cock-sucker who loves her work.