Welcome to the forum too.....
I used to clean carpets.....done the Prochem course and bought all their gear and had no problems with chemicals or machines etc.
However, i would say that if you price the jobs right...i.e the highest you can get away with!! You would want a minimum of around 2 complete houses per week. If you were to charge in the region of £200.00 per house = £400.00 per week minimum.
Obviously, if you got a whole house each day = £200.00 x 5 = £1,000 per week
You should also try the carpet cleaning section of this forum for other pointers ans see how others are doing in the business
All the best
Tim