A valid drivers license and a DOT medical card.
Yes from Oregon
Yes.
No, it is not necessary to possess a drivers license in order to register a vehicle.
No
A hazardous cargo certification and valid drivers license
No.
Yes
Commercial Drivers Licence, Restricted Drivers Licence
No, you may only possess a drivers lecense issued by the state in which you reside.
To get a commercial drivers license, unfortunately for you, you must be 21 years old. It seems you have a while to wait, but maybe you can work on a career plan while you are waiting.
Legally you can only possess a drivers license/permit from the state in which you RESIDE. Therefore, you may work in another state but you can only have a license from your HOME state.