My first poker book was Phil Gordon's and I really like it but keep in mind that all poker books
treat villain's like poker players. Most villains in the micros (and I'm assuming you are playing micros) are not poker players.
I have read 3 books. My personal favorite is The Poker Blueprint that I only bought when I started playing 6max. Great book! But then again, better for higher stakes.
I can't stress this enough: if you are playing micros read books with a grain of salt. Ask questions in the forums, post hands time and time again. You'll get a lot of help and much more useful and contextualized information.