Never aproach a prospective customer by saying "YO, YA NEED YO GRASS CUT"? I think that would be a starting point. Other than that make sure you only take on work that you are equipped to handle. Never make a promise you don't intend to keep. Be fair on your prices and at the same time remember that there are those of us that make our living doing this, so if your part time price as though you were full time. Never cut anyones throat just to get a job, you'll wind up cutting your own in the end. Act professional, the industry as a whole will appreciate and respect you more. Keep your vehicle and equipment clean, as well as your self! If I think of anything else I'll let ya know.
YO.....mer
P.S. Take the next week off and read all the threads you can, use the search feature at the top as suggested. Take notes and report back in 3 months.