To apply or not is the question

Good day-

i am hoping someone will help me out here....I am in the midst of applying to St James but have a question:

1) I had completed my degree for more than 10 years now ( basically am ready to tackle an old dream of med) but lack any physics courses, is that going to affect me tremendously in my basic sciences at med school?
2) I am really confused with clinal rotations vs residency, what's the diff and at which point are u considered a dr...after residency or after USMLEs? Coz if One can't get residency in the US can one opt for Canada or
Uk?


thanks a bunch