The heart of the module is the list option. This enables you to create tables with custom user fields.
In order for your maps view to work, you need a Google Maps API Key. How to get one is described here.
Not all custom fields that can be used are supported. But do not worry, you will not use them.
Setting up is done as you install a usual module. You can install modules only once, but use as much instances of it as you like.