Work hard, get the grades and stay out of trouble. Be the “golden student” in every class, always be polite to all students and staff, even the cleaners. If you show that you are trying really hard to change your ways and move on then any college will have difficulty in refusing you, especially if your school can put in a good word. The main thing is not to talk about the fight/exclusion at all to any students, and if the subject comes up refuse to talk about it. Show that you have seen the error of your ways and that you are ashamed of that part in your life.
The best thing, is that you want to move on. If you show people that you are serious about this then you should be fine. Good luck!!!