'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?
brevity is the soul of wit - shakespeare. Tiny ad:
Contemplate spending the next 20 years building a better world in montana