If you are under 18, you will not be allowed to drive between 11PM and 5AM. For the first six months, you will not be able to drive with more than one non-family member passenger who is under 18. During the second half of that first year, the number of non-family member passengers under 18 allowed in your vehicle increases to three, meaning you cannot drive with more than 3 non-family member passengers who are under 18.
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.