Well, if you got some tup or wether lambs, they wouldn't need shearing this year, they could go to the butchers in autumn and you'd get some experience of keeping sheep and decide if you like it or not.
You would need to divide up your acre, so that you could rotate the sheep around, moving them every week helps avoid worms. 4 sections. 2-6 lambs would be enough, depends a bit on breed and therefore size, and also what your grass is like.