The NRA website might be able to help you
Yes it would.
Yes, you do need a FL license to register your car in Florida. You can get your drivers license changed from RI to FL and register your car at the local DMV office.
You may pawn a firearm you own at a pawnshop that has a firearms license- not all pawn shops do.
You'd have to either sell it to an FFL dealer, or sell it through an FFL dealer on consignment.
it is 50$
Yes.
you need to go to the license bureau
Yes.
When does a marriage license expire in FL
No
No
No. A suspended license is suspended in the whole of the US.