Most colleges in the states have online applicatins available. You can contact the schools that might fit your academic/athletic interests and provide information to the school and coaches. If you have very good grades there is a lot of academic money available, once you send in the college application, you will receive a letter with th e amount of academic mney offered. You can also contact the coaches of schools directly and send them your baseball information. If you havent already done it, you might want to attend some baseball showcases to get a feel for what level of schools to target. In my son's case, many of the private schools offered enough academic money, to make them more attractive financially.
I know that there are a lot of summer teams from canada that play in the states to attract college attention for baseball. Maybe you can look some of the up and contact them to find out more about the usa/canadian possibilities. I know the coach from university of niagara attended the blue gray battle of the states in florida last year, and the sandlott league out of tennessee had several canadian teams playing in it so you might want to check out their website.