'Do well' is not enough detail for us to help you.
What conditions do you need your sheep to do well in?
Especially the climate, the topography (upland sheep won't appreciate spongy turf and lowland sheep don't climb as well and their hooves grow more slowly.)
What sort of management program do you have in mind?
passwords must contain 14 characters, a number, punctuation, a small bird, a bit of cheese and a tiny ad.
Escape to gardens and natural buildings (for free-ish) in Montana