Silent NPCs

When I spawn some NPCs in my gamemode with ents.Create, they spawn silent and never make any sounds.

They move about but they seem to stutter slightly, and are not smooth at all.

Am I missing files on my server or am I spawning them wrong?

Make a SNPC. So much better.

Does anyone have a good tutorial on how to make a simple SNPC?

How would I stop the NPC from attacking certain teams / players?