My first: Item

There are different types of Items you can create:

• Scenery (Rocks, Plants, Trees, Shelves etc.)
• Lootable items (Shells, plates, food, gems etc)
• Iteractable Items (Chairs, Beds, Levers, Doors etc)
• Weapons

To create items you will need some 3d modelling and texturing skills.
In the editor 3d models are saved as granny files .GR2 more info on granny 3d here
The textures are saved as DirectDraw Surface .dds files more info on dds here