There are some basic tutorials on the web that are useful ( in intellipoker for exemple). I don't recommend you to read a lot of books and ever more stupid: TO BUY BOOKS!!. The best way to learn in poker is the experience, the more you play the more you learn, just analyze your wins, losses, watch how elite players play.
One of the big mistakes that people do is to read some theory, then try to including in his game, but they don't know the reasons. you need to have a conviction in your decisions, as real life if you can't decide for yourself, you'll never be successful in any matter.