PEDIATRIC ONCOLOGIST HELP!!!?

I want to be an oncologist doctor. I am going for FULL IB diploma in high school. What classes should I take after high school? I need financial aid in college so whats a good medical oncology college that has good financial assistant? & What classes should I take in under grad college? & Then for my 4 years at a medical school what school should i go to? & what classes should i take? & what does it mean by 4 years of residency? Do I need to stay there for 4 or more years? Won't I do that while studying? & Is it a bad idea to get married while trying to become a pediatric oncologies in college?