Talk to them
I just started about a year and a half ago. Don't hand out flyers, your wasting your time. Most reputable tree co's don't hand out flyers, because they don't need to, and people know that. What I did was drive around and look for nice neighborhoods that had trees that looked like they needed to be removed or pruned very badly. Then, I would go knock on the door, introduce my self, as the owner of a tree service that is just starting out, and that I noticed that some of their trees were in bad shape. Then, they will either say no thanks( and you thank them for their time and give them your profession looking business card) or say how much would you charge for ____. Then, you give them a bid, and you tell them that you bid higher because you are insured and do top notch work,(if you don't you need to work for a Good tree co for a while and figure out what top notch work is). You will get more jobs knocking on their door and talking to people than you will by handing out flyers. Once you do some jobs, if you are good, you will be noticed. And don't be cheap, work half as long for twice the money! Just my 2 c