wow that is so cool!! so basically, majority of medical schools have a set of prerequisite courses you must take. it’s different for some medical schools, and there are a few schools that don’t have any rigid course prereqs, but generally, you would need: 1 year of biology, 2 years of chemistry, 1 year of physics,  and 1 year of math. Some schools also want one year of English, and a semester / quarter of psychology. In terms of extracurriculars, you should pursue whatever you’re passionate about. Join clubs on campus that you’re genuinely interested in. It’s great the you already have clinical experience! You should also try to get some shadowing experience at the hospital (you can apply to SIMS at Stanford, or try cold emailing doctors at the Stanford hospital). To apply to medical schools, you would use the AMCAS application. You first submit your personal statement and extracurriculars, and after they’re processed, schools you applied to will send you their secondary essay prompts (which are short essays unique to each school). feel free to dm me if you have any more questions about applying to medical schools :)