If they catch you driving on that expired license, yes.
The police may impound a car if it is involved in a crime, abandoned, illegally parked, or if the driver is arrested and the car needs to be removed from the scene.
So long as you don't drive the car w/ the bogus plates you are fine. If you drive the other car and get caught; expect an impound and a fraud charge.
If you are summarily arrested on the scene and taken to jail, they MAY impound your car for safekeeping, but it is not impounded as part of your 'punishment.'
Yes, and there's a good chance they will.
No, you do not need to own a car to obtain a driver's license.
Yes, in most places, you need a driver's license to legally operate a car. However, passengers do not need a driver's license to travel in a car.
Yes, you typically need a valid driver's license to rent a car.
In most states, nothing for the owner of the car except possibly having to retrieve their car from impound, but for the unlicensed driver it's a different story. The driver can be hauled off to jail until someone bails you out and pays your fine. They may just be ticketed or warned, depending on the officer.
the tow charge plus daily storage
you can insure a car with no license
Varies by jurisdiction and by how long it's been in impound. Additionally, you'll have a tow truck fee to get it out if it does not have insurance and/or if there isn't a licensed driver to drive it out of there.