Yes flying dreams are the s**t.  But be careful, if all you ever do is fly as soon as you become lucid.  Then you will program yourself do fly all of the time and you'll miss out on some serious deep stuff.  Simply reading some literature on lucid dreaming is enough to fuel a lucid dream.  I would also suggest staying away from supplements that MAY help.  After you take them for a while your body gets hooked, and people get sick when they stop taking them.