Best bet is to go ahead and research, How to care for chickens, spend some time planning a small affordable coop, Build the coop.
Next, wait until spring when tractor supply has pullets for sale
Warhorse and brown reds are very closely related warhorse just being a black - brown red, but my warhorse hens and occasionally my brown red hens will throw blue eggs
There are too many Gamefowl breeds that look the same due to purpose focused breeding. He could be a Kelso cross, Roundhead mix, etc. You could pair it with basically any gamefowl hen, and IDK how it is by you, But a gamefowl hens are generally about $50-$100 depending on breed in Mississippi