He told you how already... You need to go and learn a 3d modeling tool such as Milkshape, Blender, Maya, etc. Then you need to learn how to uv map, texture and animate a model, as well as be able to correctly import it into FPSC. It is an easy task for someone who already has those skills, however a difficult one for you who is inexperienced.
If you are curious of how to get started, I would recommend downloading the free version of Milkshape from
http://chumbalum.swissquake.ch/.
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