Do it the JW way if you are serious.

Make up a short letter/flyer and take 50 out with you.
Knock all the doors and canvass. Let's say you knock on 50 doors.
Anyone who doesn't show immediate interest - hand them the flyer/letter.
Write down all the "Not Homes" (say 20) and immediately go back round and I guarantee at least a third will answer because they were hiding first time round or have just come back.
You will now be left with about a dozen real not homes. Go again in the next couple of days and you will get a few more in.
Simples - if you can cope with the 45 or so "No thanks" you will get - but hey it's the three yes's and the two "maybe laters" you went for.
Those that aren't