How to make a short film

hi to every one, i have a very important question: what i have to do for make a video like this? : http://www.youtube.com/watch?v=cL-mR79GErU (this video is made by gmode)

It wasnt made by using Gmod.

a dude tell me that video made by gmode O_O, anyway can i make a short movie like that by gmode?

Yep.

NPC Animations, Halo npc, metroid npc, moving camera, blah blah blah.

but how i can animate a npc?

SDK Base.