I need help on becoming an Anesthesiologist pleasee help!?

I am now a Jr in high school in Southern California. I want to become an anesthesiologist, therefor I have a good 10-12 years of college in head of me, but I wanted to take some of the basic cles for college online, I don't know what cles that would be, how to get in to something like that, the cost or anything. I just figured out what I want to do with my future, but I guess you could say I need a little boost and someone to point me toward the right direction. Please tell me everything i need to do to get into this.. in detail so I understand it. haha thank you for your time and wish me luck!(: