Before creating a game you should have an adequate coding workspace setup, the easiest is Setting up Visual Studio but you can get others working with additional setup.

Create addon

You create new addons from the editor, go to Addons -> Create New..., create a new game addon, you can place this wherever you want on your disk.

Code

Once you make your addon your code is accessible through your Visual Studio solution, the easiest way to open it is through your editor.

By default, there is basic code for a game that spawns a pawn.

Content

All your content can go in folders within your addon folder.

• addons/myaddon/config - for fgd files or for defining custom asset types
• addons/myaddon/fonts - fonts here are automatically loaded and available for usage in UI
• addons/myaddon/materials
• addons/myaddon/models
• addons/myaddon/particles
• addons/myaddon/shaders - shaders placed in here are automatically compiled
• addons/myaddon/sounds