Buy a couple of cows with calves at foot - they'll know their job and can teach you before you have calving and new calves to contend with !
Breed-wise, beef natives command a premium at the moment (bless you Morrisons
) - 20ppk deadweight on Beef and Whitebred Shorthorns, 10ppk on all other native beef breeds. The premium is paid on slaughter, and you won't be finishing, but because the buyers who finish know that they'll get the premium (provided you can supply the details of the pedigree bull who fathered the calves), they will pay that bit extra for the stores. So prices for Angus, Hereford, Devon, Luing, etc, etc, are pretty healthy at the moment.
(Note that the calves do not have to be pedigree; the cow can be a different breed, or no breed. So long as a pedigree registered bull of the appropriate breed was used, the premium will be payable.)
However, buyers take a lot of notice of who they are buying from, and it will take time to build up a reputation for producing quality stock that will grow on and finish well.
In terms of producing breeding stock, that's an even longer road. BH has a good reputation, built over many decades, for producing excellent store beasts, but when we've tried offering females for breeding at our usual marts, we have found they fetch less than they would in the store ring. (Where, ironically, quite a few of our heifers are, we know, bought for breeding purposes.
)
Whether it's easier to get customers for the breeds popular with smallholders, I wouldn't know. But if so, look at Dexters and Belties, yes, or some of the other colours of Galloways (more on this in a mo) or one of the very rare breeds.
Jersey females are bought by dairy farms only if they are bred on a dairy farm from milk-recorded mothers. Whether there is a market for selling trained house cows to smallholders I will be finding out one of these years...
But whatever they fetch, it won't be a sensible return on the amount of work (and cake!) it will have taken to get the girl to that stage.
You could consider breeding one of the breeds at risk which are so rare there is a demand - Shetland, White Park, Irish Moiled, Northern Dairy Shorthorn... (alright, I don't know if there
is a demand for NDS, but I
want there to be as I want them to be rescued! If I'd known about them when I started with house cows, I just might have started there.... but I'm well into me jerseys now
)
Back to the Galloways... Belties are a separate breed now, and most people seem to think that the 'other' Galloways only come in black. But in fact they come in a huge ranges of colours and markings, some of which are really cute and will, I predict, become as popular as Belties given a bit of appropriate marketing. You can read up a bit about this on the
South Yeo Farm website.