Jason,
This website has all the information that you will need. The advice from Ken is very good, but you don't need to go to the library and waste hours when you could be practicing.
Here is a link to the "Recruiting Timeline". It tells you all that you need to do. It has sample letters and everything you will need.
http://www.hsbaseballweb.com/recruiting_tips.htmHere is a link to most of the schools email address and coaches names. What you cannot find here you can find at any university's website online.
http://www.hsbaseballweb.com/address_links.htmI have found so much cool stuff on this website that is not on the message boards.