Well, if it helps to know, my FFL is a home address and does his business there full time so anything he gets in the mail he signs for right there. You have to post the hours on the doors but that's about it he says, as long as the county allows what he does to transpire. I don't think you can really make money off of doing this part-time.
He has cameras and the neighbors all watch also. You have to have a safe or something where you store the firearms when your not open also.