Walk the neighborhood at different times of the day. It will give you an idea of the busiest businesses (ie the ones with cash to spare). Make a list and keep u

Walk the neighborhood at different times of the day. It will give you an idea of the busiest businesses (ie the ones with cash to spare). Make a list and keep updating it. Then print a bunch of official looking visiting cards and walk in and talk to the managers. The key is not to expect to sign a contract but to let them know you are around, how to contact you, collect info on their problems, and who they call, what they pay, how you can do it cheaper etc etc. With time you get a sense of how many callbacks you get after N visits and whether its viable or not in your neighborhood.