Hey man, welcome to the game development community. I hope you learn a lot and make some great games.just remember not to bite off more than you can chew like starting on a massive fps without any knowledge. One you get a little programming knowledge it will get a lot easier. Anyway unity pro costs 1500 dollars or 75 dollars per month to rent. You can make as much money as you want with it and it has much better features. Here is a link that compares them. Good Luck!!! http://unity3d.com/unity/licenses