The documents that you will need vary depending on the insurance company to which you apply. Generally, insurance companies want you to submit proof of your identity, your driving record and information about the vehicle you would like to insure.
Yes. If you are 15, a licensed driver who is 21 years old or older should accompany you whenever you are driving. If you are 16, you are allowed to drive alone between the hours of 5 AM and 9 PM. After those hours, a licensed driver who is 21 years old or older should accompany you. Additionally, you are allowed to have only one non-sibling passenger under 18 in the car while you are driving.