This template is list template - it is meant to display search&list type results in the map. So you need a content type to store records with coordinates and seach&list type to show them on a map. Most common error is to forget to add google maps key, if this is your problem you should see an error in javascript console.
If you just need to display one location then you would be better off to use freee text field and put google maps code generated on their site in it.