NH historically was a lot of sheep farming because it’s grow season is pretty terrible. That and potatoes upstate along the Connecticut river (lots of abandoned farms up that way if you are looking for cheaper land near Colebrook). There is a town hobby farm in Bedford that has a variety of livestock on an old sheep farm, that could be another good spot to call and get a feel. Most successful farms now have a tourism component since it’s easier to sell the idea of farming to folks than actual produce.