Take a deep breath and slow down.
First, even the super most selective schools will evaluate your transcript in the context of your school. Your GC will have the option of ticking boxes from ‘most’ to ‘not’ rigorous. Once the ‘most’ box is ticked, the colleges won’t be looking for anything more. APs are not a magic bullet, and there is no set number you ‘should’ take.
Second, self-studying for APs doesn’t get bonus points from AdComms. The only reasons to self-study APs are 1) you are trying to get as many credits as possible to transfer; 2) you are trying to get exempted from intro level classes (and note that the rules for both of those vary a lot by college) or 3) you are applying to universities outside the US who use APs for admissions.
Third, if you really truly want to go to medical school the best college for you is the one where you can be a star, get top marks, and graduate without debt.
Finally, read this from MIT admissions. Use it as you HS plan 