The following tutorials were created and supplied by MNeMiC. Many of his tutorials use the tscc video codec which can be found here. For more information about him and his tutorials, visit http://www.mnemic.tk/
3D Models into Usable Items - This Tutorial will go over setting up a new .def file to suit your new items in a mod and getting a key item to work in a map
Enemy Skinning - This video tutorial will show you examples of adding new zombie textures into the game using .skin files.
The following tutorials were created and supplied by birritan. These files are all about modeling. These will get you into creating and importing custom models into the game.