Louis, sending tapes at your age is a waste of time, money and effort. What I would do on the other hand, is contact W. St., find out who the coaches are (Any other schools that you may also want to consider also). Write them a letter, tell them of your ambition to play for them and see if they have any open clinics that they put on. If you don't hear back, follow it up with a phone call. The best time to do this stuff is at the end of this month/Start of Sept. because school is just starting and they really don't have any time once the season starts. If they offer a fall or Christmas clininc, do everything you can to attend, again as part of the discussion with the coaches, your approach should be; "What can I do to help this team and what is this coach looking for in a player"? Get the coaches advice on what he wants and how you should approach it...then DO what he says. This isn't a gaurantee that you'll make the team but it will give you the best possible chance at a shot. Keep your grades as high as you can get them and start now on studying for the SAT/ACT's and try to score as high as possible on these (My son would be playing D-1 ball right now if his grades hadn't slid).
Remember that the school of choice, for many reasons..may not have a place for you..so have a plan B,C,D,E of schools, consider not only D-1 but also Community College/JUCO, you may find you have more opps to pitch your first 2 years and then keep in contact with your desired D-1 and be ready as a Jr..
At some point a coach may want to see video of you...I'd suggest a U-Tube gallery of select pitching aspects of you...Wind-up, stretch, pick-offs, from a third base view and a behind the plate view if possible. That way you aren't cutting dvd's and having them collect dust in someones office and it is very easy for any of them to access by just e-mailing the link.
If you put a solid plan in place and keep at it, adjusting when it proves that one path isn't working, you can be in position...not just for baseball, because planning for success is a life's lesson and if you put solid plans in place going forward you will succeed in life.