Books are a great start and your best friend should be the FAR/AIM. If you know the stuff in there than you'll have no problem passing any of the written exams for sure, let alone being a very knowledgable pilot.

Deciding on where to go to become a commercial pilot is different for everyone. You can chose to go to an aviation college, you're local FBO, or even a devout pilot training center. Usually the decision boils down to cost. It can be very expensive no matter where you go, but sometimes you can find extra grants and what not to help you out.

Whatever you do be sure to do your research before you jump head over heels into something. Good Luck!