Creating Content
Creating content for the engine is entirely data driven. The engine contains a number of pre-defined places where content can be setup for use as part of a project. These most commonly include:
Script files
Maps defined in the maps directory
All of the content for the engine can be created by hand. However tools exist to help the user create content. Southsea is a tool specifically to design maps/levels for the engine, and should be investigated if you are looking to create or edit maps.