Hi Al. I know others will shoot me down but the best piece of advice I can give you is don’t come into carpet and upholstery cleaning.
There is no demand for it that’s why you see no other vans around, the public have a low general opinion of it and are not willing to pay professional rates. The customer has too many choices that filter a potential call from getting to you (Hire, Replace, Buy own machine)
Its ok if you are retired and looking to earn a few bob on a weekend, as for a career, forget it.
Look at keeping a full time job and doing night school at a local collage or similar. Electrical, Plumbing, Refrigeration Engineering, Accountancy etc etc the list is endless.
Make a future in something technical thats in demand.
Sorry but I would feel very guilty telling you otherwise.
Matt