The listings do not show after selecting the listing page

You need to flush the permalink by going to Settings -> Permalinks -> hit the Save changes button.

How can I change the units, from kilometers to miles

You can change it by going to Dashboard -> Listings -> Settings -> General tab -> Measurements

How can I set the listing to be in a list format once it has opened on the listing page?

You can set it in Dashboard -> Listings -> Settings -> Listings tab