what do i need

What all do i need to register it in maryland? Can it be just a bill of sale? are there emissions? Im looking this up for a friend, I do not live in maryland and couldnt find much of anything on google about it.

Does anybody know if the make Ford Racing is a good gear set to get. I want to put 3.73s in but not sure what make to get? Also can you tell me if the computer needs to be reflashed. And what do I need to get the job done. This will be going in a 1998 mustang gt 5spd