Elliot
Yes there is a lot more to it than all that.
Pricing will depend upon your costs, market, area, competition etc. Usually prices will start at £1.50 a sq yard and up but you really want to be aiming at £2 plus a sq yard.
You will need more than just a machine and expect to invest at least £3000 on a new machine plus equipment. Thats for a basic machine.
Really you need to ask yourself is carpet cleaning something you WANT to do or just to play at because if the latter then youll not do well in the long run. Dont forget if your giving your current window clients excellant service then theyll expect the same from carpet cleaning.
The first thing you need to do is go out with a cleaner to see if carpet cleaning is for you. Then you need a training course asap before you do anything.
Try
www.prochem.co.ukwww.alltec.co.ukwww.ashbys-uk.comall the best
Mark