Word of mouth is #1
Go to your town & surrounding towns ....speak to the road agent .
And get your foot in there for some nuisance beaver trapping.
Then the road agent will send you trapping work when people call the town..for private work.
Here in NH..trappers fill out a sheet ..of the towns they want to cover for nuisance...Send it to Fish and game...and they will give your name and number out too
Sadly in PA he's not old enough to have an NWCO license.
Best bet in PA is knocking on doors.
Like was said above... Avoid them while they're bailing or moving critters around and meal times.
I've knocked on a few doors during the day and talked to the missus first. Had him either call me, or give me the best time to catch him while not busy.
Don't lie and say you'll catch the coyotes off his property.
Start off with coons near the corn crib, and skunks.
Then move on to other critters.
One of the best permissions I ever got was by starting out catching rats and coons near the chicken house.
The wife will be concerned about the cats and dogs. Assure her you'll do everything in your power to avoid them.
Keep him updated on what you're catching. I've had farmers see me and come over to see what I caught that day.
A small gift at Christmas time is also a great way of keeping permissions. It doesn't have to be huge. A meat and cheese tray or sometimes even a card thanking them.
I'm not sure how old you are, but don't get so much property that you can't handle it all. Keep it manageable for the time you have. If that means only one small farm, then that's all you can do.
Be respectful of their property. Close gates and doors. If you happen to catch a cat or dog, let them know. You don't need a critter showing up at the door limping or hurting without them having a heads up.