Pratice on your house house first, then do the neighbors for free, then friends cheep to get used to the business. My first year I didn't make any money just gained experience. This was the time I used to perfect my pricing. I would guess-tamate the price of a house.(sq footage) Then I would measure it(linear) then I'd do the work and see how long it would take me. Say if it took me 4 hours to do a 2 story 3000 sq house. I would charge $1.50 a linear ft 50x 60= $270. OR I want to make $75 an hour= $300 or you could do sq footage 3000sq ft=300 ( $1.00 sq ft) thats 3 ways to get a price. But after a while you should be able to just walk up and measure that house and spit out a number because you know how long it will take you to clean a 3000sq ft house!!