A Simple First Map
From Mod Wiki
This is the barebones guide to creating a barebones map. It won't have terrain nor much gameplay, but it will demonstrate the basics of mapping for ETQW, including how to launch the editor, create a basic map, then compile and run it.
Launch the Editor
Having installed the SDK and set up its paths correctly, tick the 'editWorld' tickbox and press the 'Launch SDK' button. A few moments later and the editor should be loaded with a blank, empty map.
Map Basics
Before we do anything further, you need to remember what all maps need