What is a good way to make a round system?

When I try to make a round system (like mad murderer, phantom forces, ect.) I always get lost on how to make it a continuous loop. I am pretty sure while loops and repeats are useful when making these types of scripts but I need a little help on how I could do this.

Here is one of my unfinished scripts.

local gameFolder = game.ReplicatedStorage.Game
local events = game.ReplicatedStorage.Events
local playersInMatch = gameFolder.PlayersInGame
local currentTime = gameFolder.CurrentTime
local playersInServer = gameFolder.Players
local gameInProgress = gameFolder.GameInProgress

minimumPlayers = 4
xpReward = 10
creditsReward = 5
intermissionTime = 45
gameTime = 120
	
playersInServer.Changed:Connect(function()
	if playersInServer.Value >= minimumPlayers then
		
		while playersInServer.Value < minimumPlayers do
			wait(1)
		end
		
		currentTime.Value = intermissionTime
		
		repeat currentTime.Value = currentTime.Value - 1
			wait(1)
		until playersInServer.Value < minimumPlayers or currentTime.Value == 0 
	
	--Start Game
	if currentTime.Value == 0 and playersInServer.Value >= minimumPlayers then
		
		events.GameStart:FireAllClients()
		
		local player = game.Players:GetChildren()
for i = 1, #player do
	if player.Stats.AFK.Value == false then
	local playerTag = Instance.new("StringValue")
	playerTag.Value = player.Name
	playerTag.Parent = gameFolder.PlayerList
	
	playersInMatch.Value = playersInMatch.Value + 1
	player.Character.Humanoid.Torso.CFrame = CFrame.new(0,3,0)
	player.Character.Humanoid.WalkSpeed = 20
	player.Character.JumpPower = 40
	player.InGame.Value = true
end

wait(5)

local player = game.Players:GetChildren()
for i = 1, #player do
	player.Character.FF:Destroy()
end

currentTime.Value = gameTime.Value
gameInProgress.Value = true
end
	end
	else
		return
	end
	
end)

--Win
playersInMatch.Changed:Connect(function()
	
	if playersInMatch.Value == 1 and gameInProgress.Value == true then
		
		playersInMatch.Value = 0
		
		local player = game.Players:GetChildren()
for i = 1, #player do
	
    if player.InGame.Value == true then
	player.Stats.XP.Value = player.Stats.XP.Value + xpReward
	player.Stats.Credits.Value = player.Stats.Credits.Value + creditsReward
	events.Win:FireAllClients(player.Name)
else
	player.Stats.XP.Value = player.Stats.XP.Value + 1
end
end

wait(5)
events.Reset:FireAllClients()

end	
end)

As you can see it is very unorganized and doesn't even loop. I understand how to teleport characters, reward people, and all that stuff. It seems simple when I think of it but once i start scripting everything gets unorganized and confusing. If anyone could possibly give me a simplified example or a list that'd be great. Thank you.