Theory doesn't require books. Ask your guitar instructor about it, but there's nothing wrong with using books for theory. THere's nothing wrong with using books at all. But some of the books out there are really crappy, and the purpose of having an instructor is so they can instruct you not give you a book that instructs you and just sort of shove you along. Looks like your of to a good start.
The reason why I'm so against book learning is because I pissed away 2 years in one book without a teacher. I mean it's really is a sad story.
There's nothing wrong with tabs either. But it is impossible to learn a song with out hearing it. I mean you can't just look at tab and presto you know the song.

Cheers
:D