I live 20 minutes north of a town with a couple walmarts, academy, dicks, two bait shops, and a few LGS/Pawn shops. There is also a few FFLs out in the countryside. One of which advertises $12 transfers. Has his truck painted up in advertising. And here is the big one, he is a preferred FFL for both Brownells and Midway. Meaning people dont have to even contact him prior to purchasing an FFL controlled item and have it shipped to him. That is a huge incentive for getting those easy $$$ from transfers.
JoeBob Outfitters started small, in Hays, the largest town in the "desert" between the Flint Hills and Denver (400 miles). Now he ships stuff nationwide. He got into it full time about 12-15 years ago.
Down in Toronto, KS, there is a guy who has a bait shop at his residence. Its in a detached garage, and when someone pulls in, he goes in to help em. On Friday and Saturday nights, he and his good natured buddies can be found there drinking beer and BS'ing well after ten o'clock, still open for business. He obviously sells bait n tackle, but also necessities like TP, ice, smokes, snacks, drinks, and camping and fishing baubles. Another place sells all that, and rents movies, sells more food stuffs, and has a small deli/country kitchen. More of a general store really.
Just food for thought i guess. Absolutely get set up to sell hunting and fishing licenses. That brings in business too.
You should talk to outdoorsmen and women in your area. See what they use and would like to see. Specialize in that and add in more generic stuff as time goes on. Basic camping essentials have a nice profit if there is any of that going on. What outdoor activities are also going on? Things like kayaking, hiking, trapping, etc? Depends how much you want to focus on hunting.