Hmmmm.....one thing. Okay here it goes.
Know thyself. You have to know what you want to get out of your 4-5 years of college (baseball) before committing or enrolling. Have a keen understanding of what you want to do when you graduate college because you just spent a lot of money and time on that education. Be honest with yourself. On the flip side, college may not be ideal for your situation and you have god-given ability to play professionally out of high school. Understand your skills and listen to what others (edit: qualified others) say about your skills.