Qualities to look for when buying Tunis sheep tommorrow?

I'm a newbie with sheep and just want 2 ewes with lambs to "manage" a pasture here that keeps getting overgrown. I'll be feeding hay too, as needed. Not looking for a dairy animal, more like a meat sheep (although there are no plans for that, a friend has said they'd buy one in the fall). I've been around a friend's sheep farm, but I just don't know what characteristics (or flaws) I should be looking for. Anyone have resources?