Create an Animation

I have an existing game model that requires more animations. The model is in Blender format (.blend), and is of a killer with a knife. I would like to add the following animations: - Walk quickly towards victim with knife raised over head - Stand in front of victim with knife raised, ready to attack (to be looped) - Strike with raised knife - Take a hit (layered on top of other animations) - Take a big hit - Stunned in pain (to be looped) - Look around, searching for victim (layered on top of other animations) - Perform a dark magic ritual (to be looped) - Have a seizure - Have a headache, clutching head and shaking - Attack a barred door, trying to break in