In my area we don't have to register, the one thing we do, do is we have to notify the game wardens of what we are doing....kinda goes like this.
Once the red flag is up, we contact to local vets, feed shops and send out flyer to let them know that if they have a problem they can contact us. Once we are contacted, we setup a date to be there, we advise the land owner to get in contact with the local game warden in the area, usually they are pretty nice. Once we meet the land owner and game warden to get access to the property this way it lets them know we are gonna be on the property hunting and setting up traps. If we get kills, and most of the time we do, we notify the warden, they give us tickets to turn it, then we turn in the tickets for the money. Most of the time we eat what we kill, or we donate it to families in the area, food banks, etc. We made some nice money doing it, northern counties get it the worst though, southern are not bad, but they are a nusince to the farmer and ranchers. Biggest thing is, always keep your hunting license up to date cause that's what the game warden cks first. It's just a responsible thing to do, and to teach to our younger generation, cause sometimes we take them out too hunt as well....