Congrats! It sounds like you should have no problem being a NMSF! Nothing to do until September. But at that point follow here or Compass Prep so you know cut-offs are released and what they are for IL. Our school has very few NMSF and the first one had to push the admin to give the him the information needed. Be sure you get the information for logging in, etc in a timely manner because the due date for the application for finalist will be early October.
Before that, just start looking at the colleges that might interest you. This thread might be useful: Big merit NMF/NMSF schools and their specialties - #181 by fiftyfifty1