Check my script?

Would you check my script really fast for Data Persistence?

local debtKey = "PlayerDebt"
local cashKey = "PlayerCash"
local pageKey = "PlayerPages"
local bookKey = "PlayerBooks"

Players.PlayerAdded:connect(function(player)
	if player:WaitForDataReady() then
		--Create leaderboard
		local ls = Instance.new("IntValue", player)
		ls.Name = "leaderstats"
		
		--Create stats
		local debt = Instance.new("IntValue", ls)
		debt.Name = "Net Dues"
		debt.Value = player:LoadNumber(debtKey)
		
		local cash = Instance.new("IntValue", ls)
		cash.Name = "Money!"
		cash.Name = player:LoadNumber(cashKey)
		
		local pages = Instance.new("IntValue", ls)
		pages.Name = "Pages read"
		pages.Value = player:LoadNumber(pageKey)
		
		local books = Instance.new("IntValue", ls)
		books.Name = "Books checked out"
		books.Value = player:LoadNumber(bookKey)
	end
end)

Players.PlayerAdded:connect(function(player)
	player.Chatted:connect(function(msg)
		if msg == "/save" then
			if player:FindFirstChild("leaderstats") then
				player:SaveNumber(debtKey, player.leaderstats.debtKey.Value)
				player:SaveNumber(cashKey, player.leaderstats.cashKey.Value)
				player:SaveNumber(pageKey, player.leaderstats.pageKey.Value)
				player:SaveNumber(bookKey, player.leaderstats.pageKey.Value)
			end
		end
	end)
end)