'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?
Last year, this tiny ad took me on vacation to Canada
permaculture bootcamp - gardening gardeners; grow the food you eat and build your own home