Hi Plums, I can recommend Shetlands - easy lambers, good mothers, usually twins and they are easy to handle as they are not that big (and the tups have horns, so somewhere to hold onto..., but girls don't - easier when clipping! - my legs are usually quite bruised after doing the boys!). If you get Shetalnds from a small flock they come usually ready bucket-trained, and mine have so far respected the fencing.
The wool is lovely to spin/felt and easy to clip, as they have a good "break" and it comes off nicely.
How much land have you got?
You can buy them from small breeders usually all year round, but would recommend either in autumn before tupping (and you can get a tup from somewhere else) or with lambs at foot in spring (and you can then decide if and how many you want to tup in autumn). Their lambs are best left until the next spring, they are slow growers if pure bred, but get really good as mutton.
If you haven't got any by next lambing time try and see a sheepkeeper neighbour during lambing and see if you like it - best (and worst) time of the year!!!