the best marketing I ever got was a fly-by night I hate to call it that but I don't know how else to describe them. they offered a blitz package with radio and tv for a pile of non-competing businesses - the price was dirt cheap (like $85)
and (coincidentally?) my phone DID ring off the hook for the month following. the problem: it was a one shot deal and the agents had moved on to the next town.
Aside from that, the long slow uphill climb of reliability, integrity, neatness, honesty (satisfied customers in your wake wherever you go - allowing for the occasional unsatisfiable customer)