Gorgeous kitty! He looks like a Maine Coon.
We feed our 2 barn cats about every other day. I buy cheap kibble that doesn't have food coloring (that's my best, low bar). When there's not rain every couple days we will give them raw milk or water. My goal is to let them go for the plentiful ground squirrels as their first choice, and I try to feed them enough to not get them tempted to go after birds. Once in a while they get birds but rarely, especially rare for these two. I do try to feed them lots in the spring during migration and hatching seasons.
No need to do anything with poo/pee unless they start making a habit out of using a space you don't want them to. They will figure it out.
We have one barn cat that is about 7-8 years old and the other nearly 13. They have never been to a vet and have never had anything more than a tick bite. I'm not much of a fan of vaccines, but we also don't have a lot of rabid animals around here. For parasites, pumpkin seeds, pumpkin and raw garlic can all help (note if they start looking skinny and tired). There are also cottage businesses like Land of Havilah that make multi-species herbal dewormers. We give them good table scraps- soup bones, questionable eggs, let them lick a bacon sheet clean, etc. Ours will find food in any guests' cars if they leave windows open (yesterday, fried chicken bones).
I found the cutest little cedar dog house on the curb 10+ years ago and put used bubble mailers and an old worn sweater in the bottom. They also find warmth in the barn/hay when needed. We'll leave our attached garage door cracked on the bitter cold winter nights and they snuggle on the wood stairs against the house.
We name all of our cats after treats...Licorice, Jello, Truffles, Jelly Bean (RIP, beloved), Ginger, Shortcake, Half-pint... Barn cats are SO useful. I just found a rodent nest in my woodshop this week and took care of it so easily and cleanly. We also have fewer ground nesting bees close to the house, which I appreciate,
