The most important thing to know when practicing Dragon Magick is that you've got a connection with dragons. You don't have to absolutely adore them; you at least have to see them, think about them, or just know that they are there. Wanting to be a Dragon Mage is very hard work and should be considered greatly before taking the first step.
The first step to becoming a Dragon Mage would be to find your Guardian Dragon. Not all Dragon Magi have guardians but most do. You can't spend your days waiting for a guardian to come. Often, you can't use magick to 'buy' yourself a guardian either. If you have one, you'll know. A Guardian Dragon is not a "puppy dog." The younger the dragon the more excited he/she usually is to be the guardian of a human, but you must remember that dragons do grow and so do humans. Even the smallest dragons need to be treated with the utmost respect. I have never seen a dragon disrespect a human but I have seen the opposite.
The easiest way to find your Guardian Dragon is to wait for them to reveal their presence. If for sometime now you have been feeling energies and witnessing items being knocked over, this can at be your Guardian Dragon. One thing you must remember though is when you do feel a dragon in your house it does not mean that it's "your" Guardian Dragon. Sometimes it can take years for a dragon to decide to be someone's guardian. And also, Dragon Magi don't even need guardian dragons, so just because there is one in your house or one that's been following you for years, unless he/she tells you otherwise, don't jump to conclusions and think that you have a Guardian Dragon.
Once you have communicated with your Guardian he/she will be your key to other worlds. Most of us can astral on our own, but to find a Dragon Guide we usually need to be allowed in worlds that consist of dragons. For those who have been in other astral worlds and saw rouge dragons, this could either mean they have been banned and are solitary, or they are guardians of some other being. Dragons are solitary beings, but they do all live together on one plane. There may be other dragon planes, but I myself have only been to the one, so I can only talk from experience. If you can enter this world with your Guardian Dragon you will find yourself overwhelmed with the amount of dragons that live on this plane. Not all of these dragons are going to be your friend so you'll have to tread carefully.
Few people make it to this stage because once they find a Guardian Dragon they think that's all they need to practice Dragon Magick and become a Dragon Mage. Finding your Dragon Guide is very important to follow the Path of the Dragon.
On the astral world you may either feel two things: A force so powerful that you want to cringe, cry and retreat the way you came. Or you'll feel a faint calling from one of the Dragons. The first Dragon to approach you on this world is most likely your Guide, but don't assume it just yet. What till he/she announces it.
So, you now have your Guardian Dragon, and your Guide, and are ready to start the Path of the Dragon. Your guide will be like a teacher. I have 2 guides. One for magickal purposes and one for spiritual. Though I should warn you that the Path of the Dragon is not magickal for the first few stages. You must commit yourself to a path of spiritual knowledge and wisdom first. Your guide will set out tests for you just like any other teacher and you will be informed on whether you pass or not. If you do pass you go up a level. If you fail, you repeat.