1. roll up to the curb, rail, ect. at any speed that feels comfortable. it's best to learn going at a moderate speed. too slow and you won't grind, too fast and you might fall backwards or get your front truck over top and fall real hard.
2.go up to whatever it is you're doing at a slight angle or parallel to it. have your feet in the same position for an ollie.
3. ollie up onto the object and keep your balance by centering it over the center of the board. TIP:keep your knees bent slightly to help balance yourself
4. grind for as long as feels comfortable or until you slow down and either push on the tail and turn off, ride off, or ollie off (or any other thing you wanna do out of it).