Dan the key to successful leafleting can be summed up in 2 words.......
RELIABLE DISTRUBUTION
What your leaflet says or if it's in full colour means nothing unless that leaflet gets under a potential customers nose.
Unless you can get at least 4000 leaflets delivered reliably every week don't expect to keep busy all the time , you can put out a 1000 every week and you will get a steady supply of customers but it's all about the maths, I will simplify it greatly......
1200 reliably delivered leaflets will give you a days work, so if you want a full weeks work you need to put out 6000.
How many can you RELIABLY deliver every week?