I seriously reccommend lessons too. You get a lot more than you can from a book: an expert (more or less!) to show you what you're doing wrong; live examples of styles etc.; encouragement; and, most importantly, the discipline and incentive to make you work even when you don't feel like it.

TablEdit is worth getting too. It's a brill tablature application with automatic chords, animated fingering, and all sorts of things. There's a free demo version, or you can pay for the full works (50 dollars, I think).

Keep on pluckin'!

Steve