Re: Electric Guitar
Well, if you're serious about guitar, start learning scales, chords, and songs. Playing the drums will have given you some knowledge to start with - don't tense your muscles, practice slow at first, use a metronome, etc. I've never used any actual books to learn guitar, so I can't help you there. Lessons help immensely of course.
I've played guitar for about 5 years, but was never really into it. Now I've found my home with the drums.