Hey I am a teenager looking to move all of client onto contracts this summer. I have used all of my profits from last year towards a truck and a scag walkbehind. The way I have been doing it was billing the client everytime I mowed. I would prefer to get the client on a contract that I possibly sell when I go to college. I want to stop the client from canceling when they want to. I am interested in mulching and fertilizing too. So I need some ideas for a good contract. Also where could I get a trailer for around 400? Any help would be great.