We (I) need help on actually making any of these things. We need maps, models, skins, ETC. I have close to no experience on actually making the map in Hammer. I can draw out the plans for the map. I also need some suggestions as to what kind of zombies to add, like as to what they do or how the act. You may also name the zombie.
Maps - to make the planned maps to be real.
Skins - To make dark, detailed map textures, as long with the model textures (assuming the mappers and modelers don't do this them self.)
Suggestions - Rather self-explanatory
Models - To make the new models for props (if necessary), zombies (including the originals).
Animations - To make new animations for the zombies and guns (again, assuming the modeler doesn't do it themselves.)