Most Efficient way to create NPC's for a Mod

[LooseEnds]

I'm looking at Rebuilding Winterhold via the Jarl requesting the assistants of the College and the Arch-mage after the Civil War. I've done a few building interior and exterior now I wondering how to populate the building with NPC.

 

1. Create a separate NPC mod for Winterhold or created the NPC's in the mod itself?

 

2. Is it possible to create groups of NPC's like families, Guard Patrols, Servants (cooks, maids, shopkeepers, etc...)?

Or do I have to create each NPC individually? (within the Mod)

 

Thanks for any suggestion which will be much appreciated.

 

Note: The how I'm going to get the Jarl of Winterhold involved, hasn't been fully hashed out yet but I'm just building stuff and installing a few NPC's one at a time hoping someone will be able to make some good suggestions