Nick I have been using leaflets only for advertising,quite good for choosing where you,d like to workand how much.
I get about3-4 jobs to every 500 - 1000 depends .
I also have free listings on yell .com,yellow pages.thompsons and telephone book.
I also get work from people I meet and refferal off jobs I have done.
the more pepole that seen your ads the better,as one very helpful carpet cleaner once said to me if they don,t know your number they can,t call you.
Hope this helps
Neil