So, a few things to think about:
1) an acre ish is not a lot of land for sheep.... I know people talk about having 3 to 6 sheep per acre in certain circles, but this does require rotation. so really you'd have half an acre, twice... same difference, but it's a consideration. This also assumes that you dont want a barn, veg patches, orchard, chicken run, polytunnels etc. Sheep like space.
2) have a read of the old "guide to self sufficiency" book by John Seymour, he has a 1 acre plot example in there.
3) I would start off by getting some cade/tame/pet lambs from someone, and rearing them for meat to begin with. You then avoid things like shearing and lambing to begin with.
4) They used to say border leicesters were sold with a free shovel to bury them with.... bare that in mind - although I've never had them myself.
5) Are they for meat for the house, for spinning wool, to sell to people as meat boxes? Most of these sort of questions will help to pinpoint a breed, along with your locality. Traditional breeds tend to be slower growing and theirfor tastier. Commercial and continental breeds are faster growing and heavier. I have White Faced Woodlands with a WFW Ram and also a Texel Ram - that way, any ewes not suitable for pedigree breeding will have texel cross lambs (tasty because of the WFW in them, but faster growing for a pre-autumn crop), whilst the rest stay pure for slower grown meat and pedigree breeding stock. mind you, most of this is not relevant on a 1 acre plot.
6) if you do start to breed, bare in mind that you have to feed both the ewes you started out with, plus the ram (unless you can hire), plus the lambs they have. Don't bet on the lambs all finishing before the autumn, and if they don't finish before the autumn, they will go "growy" and put on bone growth not fat... so you'll have to keep them till spring.
Basically what I'm saying is that breeding sheep in anything like a sustainable way on 1 acre is a big ask. you could do it with some intensive methods - creep feeds etc - but then what's the point? You'll have a fast grown watery lamb joint at the end of it.
once you have a local contact cade/tame/pet lambs are available every year for between £10 and £20 generally.