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I am a newbie too, but I wouldn't dream of starting up with something like this. I would say this was aimed at the homeowner who wanted to do their own carpets, not a commercial cleaner.
Try Ashbys, Cleansmart or Alltech they all do business starter kits, but be prepared to send at least £2,500 on basic equipment, if like you say you have £800 to start on your other thread then you could easliy get the rest on credit. Don't forget though you will also need money for van, insurance, training, marketing, the list goes on and on, but I am looking to spend a minuium of £8,000 to £10,000 to get started. I know Ashbys do reconditioned Ninja's, and you could always try ebay, but my advice for what its worth is to do research on this site, there is lots of advice hear, you just have to do a bit of digging.
Richard