Where do I start my career as an aircraft mechanic?

I am currently a sophomore in high school and I am strongly considering a career as an aircraft mechanic. I have loved aviation since I was in elementary school. There is a small airport in my county which controls private jets, and propeller aircraft. They offer pilot training, skydiving, transportation, and repair services for aircraft. It is my dream to be a mechanic for a major international airport about an hour away from my current home. I was wondering what classes I should take in high school? Should I start out working at the small airport, and what are the chances of them hiring me? What other steps should I take to be an aircraft mechanic for an airline at a major airport?