How to run away from home?

I'm gong to run away from home soon. Don't tell me why I shouldn't I'm not interested. This is what I need to know: I'm thinking of taking a car, that way I have transportation and a place to sleep that's warm. Obviously I can't take one of my parent's cars, but I was hoping I could find a really cheap one. I also was wondering if it would be possible to enroll in a local high school without parents, or I could take cles online. Please give me any tips you have. Thank you.