Righty ho, know a bit about this....
Wool marketing board do a course every year, it's about £180 but I think it's half price if you have a number, it's really really worthwhile going on this, you learn over two days and at the end of his should be competent to shear your own sheep without slicing bits off them, don't expect to be quick, it's hard work if your not used to it, but the bowen method taught will save your back and also allow you to keep the sheep under some form of control and as little stress as you can manage - and you'll get your blue seal, if you do good possibly (although I doubt it) bronze
Now as for equipment, to do the course you'll need a hand piece, I'd reccomend getting a reconditioned unit from horners or George Mudge, cost around £100 to £ 150, you will need a solid drive ferrule for the course, about £15 I think, say 5 combs and a box of blades to start, a screwdriver and a pair of moccasins if you want to look the part (mocs are great), you could invest n a pair of shearing jeans and belt (getting expensive now... But you don't need the clothing)
Anyway that'll see you right for a start.
Then to shear at home 'all' you need is a shearing machine, something like a lister with a flexible drive (reconditioned will set you back about £350 - £400, a circuit breaker, another circuit breaker (can't have enough) a circuit tester, and something to hang it fro - oh and a flexible drive ferrule, the solid drive is different, a machine with a solid drive is better for your technique but way more expensive
Thenof course - if your any good - you can offer this to other smallholders with 10 or 15 sheep and get paid and make a bit of cash of it
I only do small flocks these days and then more as a favour because my shoulder is buggered and whilst I can still shear a sheep quickly I properly suffer with the pain after each sheep.. And I'm not as fit as I used to be.. So it takes me too long fr it to be economical anymore, just like to keep my hand in