Spawning generic NPCs in a specific location.

[Kageryu]

So I recently got my hands on the Creation Kit and I have a large house mod. I want to know how to spawn random generic NPCs in that house. During the day, there shouldn't be as many NPCs as there should be at evening or night. There should be different kind of NPCs that spawn, from beggars and warriors to nobles. What would be the easiest way to do this? Thanks in advance.