i wrote an article about it on the site [if the link doesn't work, just search for Dragon Magick in spellcasters articles]
angelfire's a good site, fox-moon is another good one.
it's a very solitary path, not many people actually teach it for a bunch of reasons. you also shouldn't enter into it without a few years of study under your belt. since dragons are astral, one of the main ways people connect with them is through astral projection, though meditation works just as well. don't try to lord over dragons, they can tell what your intent is from first glance, so be honest also, don't expect them to go around attacking people you don't like, or helping you with trivial matters [like SeekedxDawn said] or they will ignore you [might even attack you depending.]