Taken me 3 years to get 15 lawns to do, not that i really advertised, but do good work. I screw up on that sometimes and don't leave a property in perfect shape, and as already said, someone is ALWAYS watching you. Act professional and clients will come. I do door hangers for advertisement. I would suggest somewhere around 3k door hangers. So far put out 800 of them, and have gotten 5 calls. 4 for mowing(got 3 of the jobs), and one from a guy wanting to sell me a mower.