the best thing to do is find a good guitar teacher, and let him know your interested in music theory. Thats what i did, and so far its been pretty good. I've been playing less than a year, but since i practice a lot i can do some things that kids that have been playing 2 years longer than me cant do.
If you keep your mind open to anything that can be considered music, it makes it even easier (to me at least). I like country, blues, jazz,rock, classic rock, psychadelic rock (sp?), acid rock, reggae, some funk, anything except heavy metal.
I bought a scale book called "The Incredible Scale Finder" it has thousands of scales in that book, and its incredible. I recommend it to anybody who wants to get deeper in Music theory.
I have the flu right now so i might not be on here for a day or two :(...