When I was starting out, I posted about 5000.
I posted them. I quite enjoyed it, shorts and tshirt on, headphones in, couple of hours walking, stopping at one or 2 pubs en route and it wasnt a bad day.
If it was p'ing down I wouldnt do it.
I think the trick is to do the same areas a few times - but I could be wrong.
I never had much success.
You posted 5000 in 1 day? Been a professional for 7 years now & thatwould take me a full 7 days in most areas.
Anyway, a mixtureof tips:
1. Don't print anything that is thick or heavy as it will drastically increase the cost of distribution & can even make it impossible. Most printers will not know anything at all about distribution & so be wary of thick flyers. We had a political party drop off 40,000 flyers once....the printer had done them so thick that they weighed over a ton when they didnt need to be so thick & the design could of been done on a much smaller size.
2. Use a distribution business that does not treat everyone as self employed & that only has employees as this increases the chances the jobs will get done.
3. It's not an easy job, don't think it is & pay appropriately for the service. Never go for "cheap"
4. Always have flyers delivered solus, some people think they're getting a bargain when the flyer representing them is going out with 10 others and buried inside a magazine.
5. Bare in mind that a flyer drop for a sweet shop does not stand th chance to cover the cost, most flyer drops are for estate agents or one offs promoting an event or opening because they know they'll make the money back even from a tiny response.
6. Target the correct areas, you need to know your target audience & post to where they live.
7. Flyer design is everything.
8. Deliver 100 flyers yourself before getting quotes, you'll see how hard the job is & the be more inclined to diregard the "pay us £25 per 1000 & we'll put them in a bin for you" lot.