Where can I find cheap insurance at 17 years old with car modifications...?

Does your  insurance  a brand new stereo into your vehicle affects?
Simply how much could be the normal vet visit? and Is it worthwhile to have pet  insurance ?
"I'm an 18-year old maleI wish to add my car and me as driver to some other's auto insurance (who has proven costs) how can I do that?
"I've lost my nationwide insurance rangeCar- insurance  for 2 people in 2 places...?
How expensive of a car could I get if im military?
"He does not live with me - he lives' who has her car. How can I ensure it is so he's periodic therefore I do not have to cover $4000 annually in insurance