Is there any requirement for 2 people for a rental? I know a lot of indoor ranges require 2 people, but not sure about here.

For single shooters there's a delay option on the controller

No, you can shoot alone....but who will be releasing the clays? And if this is your first time out go with someone who has been before so you can get to know the place (trails, different ranges, etc) or hire one of their guides.

Nope. Just show up with money and fill out paperwork

No