function spawnnpc()
local testzombie = ents.Create("npc_fastzombie")
testzombie:SetPos(Vector(0,0,0))
testzombie:Spawn()
testzombie:Activate()
end
concommand.Add("spawnnpc", spawnnpc)
why is it, when i open up the game, its not actually creating the command? I assume my function is wrong, but i would like some further explanation why. 
That code works perfectly for me. It’s probably not being read. Make sure you either placed it into lua/autorun/ or in a server-side file (of a gamemode for instance).
Or you could just put it /lua/ and use lua_openscript in the console.
No, it should work fine. What matters is where are you putting the command? If it’s on the client then it won’t work; it has to be from the server.
forgot to include MAH BAD