https://www.aamc.org/download/321508/data/factstable24.pdf can give you an idea of how GPA and MCAT score affect medical school admission.
More applicant and matriculant data at https://www.aamc.org/data/facts/applicantmatriculant/ .
For cost and debt of medical school, take a look at:
https://www.aamc.org/download/152968/data/debtfactcard.pdf
https://services.aamc.org/tsfreports/