The advice to buy stores, finish them and take them to market, is ok. . . . . and I understand where it comes from.
BUT, with the current store price vs finished price, and how it's set to look for the near future, you may well invest a bit of money in sheep, quite a lot in gear, and then (especially if you dont have an 'eye' for judging if a sheep is finished) end up getting a crap price in market and being very much in the red.
If it was me, i'd figure out what you like and buy yourself a small group of ewe lambs, and maybe a couple of weathers, you can do with them the same as stores, but when ready, put the two weathers in your freezer, however they turn out, and will also have a batch of yearling ewes to start your flock with.
Just seems to me, if you are going to spend a winter caring for and learning about sheep, you'd be better ending up with a small breeding flock and meat in your freezer, than meat in your freezer and a hole in your pocket!