Try your best to locate a wholesale nursery and buy from them regularly and become familiar with their stock so you don't drive around town looking at trees or plants (the time you spent looking for the plants has to factor into the price down the line)--maybe charge a delivery fee of $40-$60-- Too many guys run around town and don't figure that into their cost of doing business-Make sure to get a check when you finish--
-type a brief estimate on a word processor stating what you are agreeing to plant and state the price. Also include your terms for payment--!!Due at time of job completion!!! When someone says to you...'bill me', make sure you have the invoice in hand and ask for the payment then and there-not later.