Whats a cheap auto insurance for teens?

I have a friend who has an additional car. He I would like to generate the automobile. He's a-insurance to the automobile and I don't have any motor insurance before. Can it be ok to generate? Liability insurance is sold with vehicles or individuals?
"I am not 16 years young but will undoubtedly be 17 next month. Therefore lets say Im 17 for now. Im looking to buy a BMW z3 because they are very inexpensive and genuinely good cars