What is the best way to study for ACE?

Hey, Im a 20 year old male. Fitness is my life, has been for years. I am in the gym 2hrs a day 5 days a week. I am big on what i eat and drink, I Work with weights more than anything. So i like to think i know the basics of fitness and lifting.

I know i dont know what i need to know to become a personal trainer. Training people is just what i think is an great thing for me. How should i study?

Is the home study a good thing? If not how do the hands on studying classes go? How many days and hrs a week and for how long? Will i be paying more for classes? Thanks for your time!