What softwars should I use if I wish to make my own custom model/enemy?

[Statyk]

You need either Autodesk Maya 2011, 3DS Max, or Blender for making models and animation. Maya works best with animation, but Max works better for modeling and UV mapping as I am told. I'm not quite sure about Blender as I tried it for a few hours and uninstalled it. I personally like Maya best. But I've heard others like Blender.

You will need either Photoshop or GIMP to do textures, and both will need a .dds plugin.