Hintercraft Systems & Spells Request

[stonneash]

Hello, I am combining some aspects of the game hinterland into a warcraft map and I have a few systems that i need help with

Hire system:
Visitors will spawn near a building, these vistors can be hired for a certain amount of gold to build a certain building and operate it wherever you have it built, and the buildings will have upgrades. the visitors should have an option after being hired to either hide in the building when the city is under attack (when a boolean = true) or defend it and attack the attackers. if you need any more information feel free to ask
id prefer having this done in triggers, but I dont mind other forms.