Permanent NPC Spawn Script Pricing Question

Hello, I was wondering if anyone could give me a rough estimate for how much it may cost to make a job for a permanent npc spawn system.

Basically I want to add spawn points for npcs that are permanent and will save on restart. The npcs should only spawn once on each spawn point and respawn after a set amount of time if killed, And possibly a way to change the health of whatever npc spawns on the point. I'm not exactly sure how adding the points and changing the values of it would work but I was thinking a console command or a small gui would work.