I imagine almost everyone on here started using a mop and squeegie, certainly the older ones among us
As Pingu stated canvassing is much quicker than leaflets alone; You get a yes or no there and then instead of being sat waiting for the 'phone to ring.
My guess is that after a period of time, when your customer list is such that you're earning a decent living, you too will see the benefits of wfp and will want to go down that road.
Start slowly, build up your business little by little, be reliable, provide a high standard, value for money service and you'll reap the rewards.
Good luck to you