18.50
You should definitely get your tags renewed if they are expired in Ohio. You should get your tags renewed before they expire in any of the states.
No
Depends on vehicle go to CO DMV website
Ohio does not set a fixed Penalty for violations including expired plates. It depends on where you got the ticket.
No. Everyone that need tags for a vehicle do not own the car. You only get the title if you own the vehicle. You will, however, need your registration.
30 days
To show your vehicle is street legal while waiting for permanent tags.
If the registration card is current, and, it matches the tags on the car, you MAY get off with a warning but if not, the most you SHOULD receive is a ticket for 'displaying expired tags.' Unless something else is going on that is not disclosed in the question, (e.g.- the tags on the vehicle are NOT the tags assigned to it) they shouldn't be wanting to impound the vehicle .
The technicalities vary from State to State, but... Generally, until the valid, current tags are physically attached to the vehicle, it is illegal to drive the vehicle. Put another way, the tags are generally not considered valid (even if they're paid in full) until they are actually put on the vehicle itself.
They have a vested interest in the vehicle. Their lien can prevent you from registering the vehicle.
Go to the dmv with your title
Normally, they'll remain with the vehicle.