bio caddy

I need help(sorry my english is rusty, i've been out of the country for a long time)

my boyfriend's graduation is in a week. im flying to there from california so i
plan to rent a car. To enter the base I have to show my ID, registration and insurance.
I can get that from the rental place right? sorry I know Im asking stupid questions
but I want to make sure because I've never rented a car in the States.

Also what documents do I need to get a vistor's pass?

If there are other things I need to know please let me know.
Thank you for your help:)

Oh is there a good place where I can rent a car?
Im 22 years old.

Once again thanks