For the promotion of your door hangers, you have to give the customers an important reason to respond. If there is discount, the customers will respond immediately. The best way for starting a campaign is the limited custom post card printing funds. You can start to test first 1000 door hangers and then distribute it among various neighbors. You will not face that much difficulty to test 200 at each location. You can do this over 4 weeks. You can easily track the highest number of responses.