Hi,
I'm sure someone has already mentioned this, but getting some training would be the first thing before investing in equipment. I'm glad I did a course before buying anything. I do jet washing, guttering, end of tenancy cleaning, conservatories etc as well, so am not a carpet master, but have still spent about £3k on equipment and have had plenty of satisfied customers over past 8 months.
You've probably got a good customer base to get work from, but having something like the NCCA or TACCA behind you would reassure your customers you're not a cowboy, however, if you've a busy round could you handle the CC as well?