The best thing YOU can do is make a list of the schools you are interested in, then go visit the athletic site for each and look for the "prospective athlete/student questionnaire" link and fill that out and submit. As said above send info to the coaches - let them know YOU are interested in them and that will star the process. If they have summer camps attend those - if they don't ask them what camps they do work at (many coaches work at Nike or adidas or other independent tennis camps).
If you are truly interested in playing in school check out the NCAA website for the dos and donst and get your parents involved to help you - and register with the NCAA clearing house.
I have my 2 oldest playing D1 (one finished last year) and my youngest is 14 and we are starting the "weeding" out process of schools he wants to visit and maybe look at.