Get the training first, its a must.
Then get your flyers/letters done and when you do your customers windows and knock on the door to get the money, hand her a flyer and say you are now doing carpet cleaning as well, show the cert to show youv been on the course and away you go. Try and get someone who has a few years experience allready, obviously not from your area to get hands on experience, you cant beat that.
You have probably got the best 'get in' that we others dont have, ie they know you already. For the rest of us its whats called a 'stress purchase' for the custy, they dont know us and arent sure whats going to happen.
Good luck.
Murky