I just find some interesting models of zombies and soldiers so I make a scene like they are facing out. I managed to animate them and attached the sound (however I don't know how to record sound from the computer by Quick Time). Things I still want to try is to make them move and make collision volume. Also I don't know how to let sound appear just when I am walk near them. I believe theses things are really important if we want to make the scene more real.