Hello, Senior Pitcher! You've come to the right place to get some advice. Welcome to the HSBBW!
You're idea to email coaches is a good one. I would advise emailing the coaches of all the schools you've already been admitted to plus others that interest you. Make sure to contact many types of programs (D1, D2, D3, NAIA, JUCO), as you can't be sure at this point who will be interested in you.
For ideas on what to say, visit this portion of the website:
http://www.hsbaseballweb.com/recruiting_tips.htmPay special attention to the "Recruiting Timeline" (highlighted in green) and "For Players, Parents and Coaches" (the top listing highlighted in black).
Being a senior, you have your work cut out for you. You might want to attend a Christmas camp at a school that really interests you. Also, check out
www.perfectgame.org and see if there is a showcase you can attend.
Being a pitcher, you will have a better chance than most at finding a place to play, as pitchers are always needed. What is your size (height, weight, frame) and what is your current velocity?
Best wishes as you get started!