By far the most important part of starting a vending machine business is choosing your machine locations.
When getting started, try to use common sense and avoid any location that you think doesn't have potential, such as locations that are dark or unsafe.
You also need to be aware of how many people pass through the location each day on average. It's very important to choose locations where the vending machine will be highly visible. For example, a vending machine located outside on a college campus is an ideal choice.
Note how many people go in and out of the location on an hourly basis. This information will give you a good idea of how many people work there and how many people visit the location each day.