When I left school I studied marketing for my degree at Leeds uni years before getting into electrical work and the only problem you will find with flyers is the ammount of trash that gets pushed through peoples doors means they very rarely read them.
Think about when you get home from work, knackered and look down to see a few black & white A5 leaflets on the doormat. Do you pick them up and read them or do they usually go straight in the bin.
The other difficult thing is hitting the correct customer at a time they are looking for some electrical work starting.
An improved way would be to make a flyer look eye catching, getting them to read it is half the battle. Big Bold wording is a great attention grabber. Also look at putting something along the lines of " If you are not yet ready to start your next project, dont throw me away, how about keeping me on the fridge or passing me to a friend who may be looking for a local, certified tradesman"
The same goes when you hand out leaflets, out of politness the majority of people will take them from you and may even pretend to read them as they walk away. However once they are out of site, it's in the bin, on the floor or into the dreaded back pocket not to be found until after the next wash.
You may remember years ago a famous advertising firm put billboard posters up with "SEX" in large capital letter accross them. And then in small letters "Now we have your attention........."
I wouldn't go with the "SEX" slogan but hopefully you get the idea.
Also you need to get yourself a logo and some branding. People gain trust with brand recognition. If they see a van with a logo on, then an advert in the local paper with the same logo, they will be less likely to throw away a flyer with the same logo on.
This is a flyer I did a few weeks ago for a local painter who asked me to design something that would look funky stuck to a fridge door and stand out from the rest:
UPDATE: just checked my recycle bin (Sad I know) and found three flyers thrown in their from Thursday. One for wheely bin washing (Never read) One for Helping Haiti (Looked fake) and one for "Double your income now"
However I have a dominos menu on my fridge even though I haven't had one in about 11 months. Good branding and I stuck it there without thinking about it.