Yes. If you are 18, you are only allowed to drive between 6 AM and 11 PM alone. You can drive outside of those hours if you are accompanied by a parent, legal guardian or licensed driver who is 21 years old or older. Additionally, you are not allowed to drive with more than one passenger unless a licensed driver who is 21 years old or older is accompanying you.
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.