What are some things that the MIT Admissions Department looks for?
There is an MIT Club of Chicago that I think you should look into. That would be a great opportunity for you to network and meet those current MIT students and get that insight. If you decide to attend one of their events, please make sure you bring a parent or guardian to accompany you. Below is a link I found to their website: http://chicago.alumclub.mit.edu/s/1314/2015/club-class-main-start.aspx?gid=193&pgid=61 Best of luck!
Hope all is well. One of the things which is looked for is community involvement in which it would be great if you can show a direct alignment towards your college/career goals. Additionally, MIT will look for the normal standards including a high GPA, recommendations, and they will review your high school transcript to see if you have taken advanced placement courses. Best of wished to you!