Qualifications
You need a medical degree from a prestigious institution. That's four years undergrad, four years med school, stellar MCAT scores, about two years of internship and two to four years of residency. Better bone up on those SATs now.
You'll need to be super smart at math and science, live and breathe STEM and you also need to have really good people skills...as well as being very business-savvy. Pay attention to those psychology, marketing, and finance classes in college.
Doctors also need to have continuing education credits every few years or so to keep their medical license current. Don't forget to press the flesh and cultivate business on a daily basis to keep a steady influx of retainers on your roster.