Andrew,
Leaflets are pretty naff. The 'general thought' here is that you'll receive a two-percent success rate with flyers. And from personal experience, I agree with that.
I spent around two weeks - full time - putting thousands of flyers out. I ended up with a round spread out all over the place; loads of drive-betweens; but over the next two and a half years my round grew more concentrated in some areas, and those areas I didn't grow, I culled.
Unfortunately I rarely canvassed, but the majority here say canvassing is the quickest way to start a round.
So look under the cleanitup.co.uk header and click on the search function. Type in 'cavassing' and start reading.
The best bit of advice I can give is DON'T UNDERPRICE.
Welcome to the forum, Andrew. If you've any questions, just ask.