How do I make my game have rounds that teleport?

How do you make a time period with rounds and make it so it teleports you in to an area after each round?

##Use a while loop.

You want the rounds to repeat infinitely, so it makes sense to use an infinite loop.

while true do
	--teleport players to the map
	wait(lengthOfRound)
	--teleport players to the lobby
	wait(intermission)
end

As for teleporting players, this has been asked a billion times before. Searching for it will yield some good answers, such as this one.