Danny,
If i was doing it all again from scratch, knowing what i know now i would do it this way,:-
Have a part time job to keep cash flowing for a while
Get some proper training from the word go
Get some hands on experience from a willing cc for a day or two
Get insurance
Buy a second hand rotary cleaner of ebay & a stack of pads
Some standard cleaners i.e prespray, rinse and some spotters etc
Some cheap leaflets from dp print etc
Market as a 'Dry' carpet cleaner
Spend any spare minute canvassing, i.e. actually knocking doors and speaking to people and businesses.
Strictly keep a database and market to it
I think the only other tool for marketing i would get is a website.
Ive probably missed a few things but you get the general idea, only after a while would i spend any more money, once ive decided it was for me and its actually making a profit.
Come to think of it I may sell all my gear and give it a go

Regards
Steve