How To Make A OnClicked Exp. Script?

I'm trying to make this this where if a player(s) clicked on a model in-game, it'd give them exp and then they'll have to wait(300) seconds for the player(s) to click it again. So how would I start it?

function onExpChanged(player, Exp, Level)
	if Exp.Value>=Level.Value * 10 then
		Exp.Value = Exp.Value - Level.Value * 30
		Level.Value = Level.Value + 1
	end
end

function onLevelUp(player, Exp, Level)
	if player.Character~=nil then
		for i = 1,5 do
			local fireworks = Instance.new("Part")
			fireworks.Shape = 0
			fireworks.formFactor = "Symmetric"
			fireworks.Size = Vector3.new(1,1,1)
			fireworks.BrickColor = BrickColor.Random()
			fireworks.CFrame = player.Character.Head.CFrame + Vector3.new(0,2,0)
			fireworks.Parent = game.Workspace
			game:GetService("Debris"):AddItem(fireworks, 2)
			fireworks.Velocity = Vector3.new(math.random(-30,30),math.random(-30,30),math.random(-30,30))
		end
	end
	local m = Instance.new("Hint")
	m.Parent = game.Workspace
	m.Text = player.Name .. " has leveled up!"
	wait(3)
	m.Parent = nil
end

function onPlayerRespawned(player)
	wait(5)
	player.Character.Humanoid.Health = player.leaderstats.Level * 999
	player.Character.Humanoid.MaxHealth = player.leaderstats.Level * 1000
--[[
	local stuff = player.Backpack:GetChildren()
	wait(5)
	for i = 1,#stuff do
		local name = stuff[i].Name
		if game.Starterpack:findFirstChild(name)==nil then
			stuff[i]:Clone().Parent = player.Backpack
		end
	end
--]]
end

function onPlayerEntered(newPlayer)
	local stats = Instance.new("IntValue")
	stats.Name = "leaderstats"

	local Exp = Instance.new("IntValue")
	Exp.Name = "Exp"
	Exp.Value = 0
	
	local Level = Instance.new("IntValue")
	Level.Name = "Level"
	Level.Value = 1

	local Coins= Instance.new("IntValue")
	Coins.Name = "Coins"
	Coins.Value = 0

	Exp.Parent = stats
	Level.Parent = stats
	Coins.Parent = stats

	stats.Parent = newPlayer

	Exp.Changed:connect(function() onExpChanged(newPlayer, Exp, Level) end)
	Level.Changed:connect(function() onLevelUp(newPlayer, Exp, Level) end)

	newPlayer.Changed:connect(function (property)
		if (property == "Character") then
			onPlayerRespawned(newPlayer)
		end
	end)
end

game.Players.ChildAdded:connect(onPlayerEntered)

Would this work?

You will want to use the ClickDetector and make sure you add Leaderstats. Unfortunately without a attempt at your script, I will not help you.