Porting Models, and how it works?

I am just wondering guys, I would really like to know how porting models works, any good Tuts out there?

Do you mean adding an addon? Or importing a object from a 3d program into the game? If its a 3d program, you need to find a tutorial that works for the 3d application you have.

depends on what format the file is in, like DAE, POF, OBJ, etc…

here is a good tut for making a ragdoll: http://www.facepunch.com/threads/542906