Roleplay house purchase Script help?

So I am making a roleplaying game and I can't figure out a system that when you buy an house it subtracts the amount of currency for thst house and after someone brought it disappear and when they leave the game it reset ready for the next person.

anyone got any ideas?

Well looking at YouTube and other sources as when i was small i wanted to do this as well so i searched on YouTube, here is some sources I've found.

Video