How should i go about starting a race track?

i am currently 17 so it will be a while before it is a concern, but i live in a city with a population of about 3 million where there are only two dirt oval tracks for sprint and rally cars. when i am older i want to start a business, i love cars and am already planning on taking technician cles, and i was wondering about the legal issues and ethics of my idea, i don't think its an issue with a drag strip so much but i was also wanting to put in an oval track and an off road track and if money allows in the future, other types of courses. I'm worried about legalities though, I'm planning on having it open to anyone whose car can p a safety inspection, and signs a waiver, but of course with extreme sports anyone could get a blowout or lose control in the safest possible conditions, and i don't want families suing me in civil court over injury or god forbid death, i would argue that they knew full and well the risk they took but anything can happen in civil law (remember the lady who spilled McDonalds coffee on herself and sued for millions) and that is not covered by a notarized waiver.