The only coven on the site made for dragons and the draconic practices is no longer active; it's been closed for a while now. Two members you can talk to are Nekoshema and fairywolf. They know a good bit about dragons.
You can check out the site http://www.fox-moon.com
Some books I would recommend are
Aegishjalmur: The Book of Dragon Runes by Michael Kelly
Mystical Dragon Magick by DJ Conway
what precisely do you need help with? fox-moon is an excellent site to look into. there was once a coven for Dragon Magick, but it was closed down [low member count i think] with the exception of a few well known spells and rituals, most information about Dragon Magick is learned first hand from dragons in the astral or through meditation.
Dragon Magick is a form of high magic, so it can be dangerous for someone new to witchcraft. check out fox-moon and the articles posted here by Dragon Magick to give you footing. also, D.J. Conway is the 'expert' in the field, while i think you should read Dancing with Dragons, try to find it at a used book store or something, i find it's kind of blah, with only a handful of information.