How do i make a Round System Script for a game ?

I am making a murder game but i don't know how to script a Round System can someone help me ?

First, are you sure it would be wise to make another murder game, considering there is already 4?

Anyways, the way people usually make round system is with a while loop.

while true do
	--Start the round
	wait(100) --Wait the time of the round
	--End the round
end

If you want the round to end under a specific set of circumstances, then you will have to make different events.