Most medical and health-related schools ask for faculty recommendations for each applicant. Millsaps College has a Health Professions Advising Committee to facilitate this process. In the fall of the year before you hope to enter medical school, contact the Committee chair to set up an interview. The Committee will ask you to get three written evaluations from faculty, then will meet with you for a short interview. This is a question that deserves some careful thought.
Professional schools are expensive.
Most curricula are so intense that schools actively discourage students from taking part-time jobs, at least initially. The majority of students support themselves by taking out student loans. Most schools have some financial support, based on aptitude or on financial need. Ask about scholarships and fellowships when you apply. There are also several national scholarships available.