Start by learning more about what becoming a strong med school applicant takes. Read thru the very informative FAQ at http://www.rhodes.edu/hpa/15890.asp They also have a nice writeup in the PreMed Essentials link on the left side of that page. There is also an excellent online handbook at Amherst I recommend to get an understanding of the process and what really matters
For even deeper detail you could get a book about medical school admissions.
One thing to avoid is placing any importance into acceptance numbers. Some schools boast incredible rates, but it boils down to one of two things. Either they start with great students (think Stanford, etc) or the school weeds out students. Look out especially for the “committee letter” which small schools with average students coming in wield like an axe to prevent all but the strongest applicants from applying right out of college; to no surprise, they often boast 90% or better med school “acceptance” numbers for their undergrads. Soon a regular poster will chime in to recommend one such school, Holy Cross.
I always ask kids that say they want to be doctors, why an M.D? Not that I know it is wrong for you, it may be the right fit, but have you actually looked into the medical field and considered the alternatives? From the day you start college it will be 11-15 years before you are a practicing doctor, depending on what field you go into. In other words, think back to 1st grade; all those years since then matches the minimum it will take to become a practicing doc! Its almost a reflex action among HS kids, they think of a career in medicine and its “I’m pre-med!” Doctors are far from the only ones in the health field that help people. Physical therapists, radiology techs, nurses, speech pathologists, to name but just a few. Before you go heavily into debt and commit so many years I suggest you explore the alternatives.