I am not sure if there is a "best way" some of the things you could do is.
Talk with your high school coach and have him make some phone calls for you.
Try and get into some camps (ie TeamOneBaseball, Perfect Game) etc
Send some feeler letters to colleges of your interest stating things like your bio, stats, and things of that nature. It wouldn't hurt to even attend a camp at your favorite school so they can get a look at you.
Hope this helps