This instructions below walk you through creating a new map mod from scratch. If you already have a map created, you can skip this step and move on to placing Actors.
In the Level Editor toolbar, click the Create Mod button to open the New Game Mod window.
Select one of the map templates. In this example, we chose Custom City Center Day.
Enter a name for the new mod in the Name field.
Click the Create Mod button to generate your mod files.
In the Content Browser, double-click the Maps folder and then double-click your map asset to load your new map.
In the Level Editor toolbar, click the Build button to generate lighting, navigation, and other data for your map.
You now have a map that provides a perfect environment to add gameplay elements to.