Hey Tulz, Go buy a new key you homo.
Maybe you should buy one of your Bro's legit keys.
Texturing stuff is quite simple if your going to use the textures already within the editor, but I guess this would depend on exactly how all those objects are made up, and how you ripped the map off the N64.
If they are made from "earth" for lack of a better description then you will need to paint them with the layer painter, or possibly the voxel painter.
If they are made from "solids" you should be able to select them and open the materials editor select a texture and "apply to selection".
Probably stuff you already know, but may not have thought of, could also check on crymod... lazy bugger.