Is it really helpful to read books ? mostly I watch tourenment on TV and learn some moves ...
What is the best book to start with ?

there are two type of play, slow game or aggressive.. you can't just pick one out and stick with it, you have to mix it so that other players won't "learn" your play.. patience is a big part of poker, you can't be aggressive in a stupid way(lack of patience) or else you will loose big time..