Get some leaflets...deliver them and go back to the same streets in 2/3 days and canvass....note down who is in/their response...repeat leaflets every 3 months..
Clean on saturdays ....you'll get seen.
Clean any houses near school & chucking out times..you'll get seen.
Set targets, review them, re-set them...have a clear idea of what you want to achieve weekly, monthly, quaterly, bi-annually, annually...
Watch your pricing....don't price low to get the job...(you will as do I

)
Try and find some other w/c in your area/region...find out what they strive to earn as an hourly rate....though not precise...could give you an idea.
Do a good job and do what you say you are going to do on the day you say you'll do it...i.e be a man of his word....
Try to take payments via internet banking/cheques...saves collecting
These are a few of the things I strive to do...I have only been going since Aug 06 and am still growing....And most of these tips were from this forum...
And when it all feels bad...come on here have a cry..and you'll feel better...
Cheers
Dave.