Are you working at the moment?? If not try and get a part time job while you get your business 'prepared' and save up for equipment, materials and most importanly IMO marketing (you can be the best in your trade but if no one knows of you they wont use you).
As someone said a website is a must these days, a tidy size van (though not new - save it for equipment), and id buy a new machine not second hand but DEFINATLY NOT A RUG DOCTOR and defo get some training. Do a search on here, everything is coverd.
If your currently unemployd then the job centre will give you (a very small) grant - better than nothing though and see what else they can do to help. Another site id say to look at is UKBF (Bussiness froum), pleanty of knowlage there for general business advice and this great forum for anything carpet cleaning related.
Good Luck
J
P.S. oh, dont think succsess will happen over night - it wont, build for the long term not a fast buck!