How can i add a cool down to this key bind magic script?

Player = game.Players.LocalPlayer
repeat wait() until Player.Character
c = Player.Character
mouse = Player:GetMouse()

mouse.TargetFilter = workspace.AntiMouse
UIS = game:GetService("UserInputService")

UIS.InputBegan:connect(function(input, isTyping)
	if isTyping then return end
	if input.KeyCode == Enum.KeyCode.Q then
		script.Function:FireServer("Projectile", c.HumanoidRootPart.CFrame, mouse.hit.p)
		local debounce = false
	end
end)

I need help adding a cooldown to this because its spammable, and the character can spam magic projectiles which is what i dont want.The first script is for the key bind and the second script is for the projectile and when it hits a object or character an explosion would happen. Can someone help me with a cooldown and where would i put it? At the end? I've tried looking into debounce but it wont work. I hope someone can help me, thanks.

script.Parent.OnServerEvent:connect(function(Player, Action, V1, V2)
	local c = Player.Character
	if Action == "Projectile" then
		local P = Instance.new("Part")
		P.Name = Player.Name.."Projectile"
		P.Transparency = 1
		P.Size = Vector3.new(2,2,2)
		P.CFrame = V1*CFrame.new(0,0,-2)
		P.CFrame = CFrame.new(P.Position, V2)
		P.Parent = workspace.AntiMouse.Projectiles
		P.CanCollide = false
		game.Debris:AddItem(P,10)
		local PFX = script.ProjectileFX:clone()
		PFX.Parent = P
		PFX.Enabled = true
		local BV = Instance.new("BodyVelocity")
		BV.maxForce = Vector3.new(25000,25000,25000)
		BV.Velocity = P.CFrame.lookVector*25
		BV.Parent = P
		local Trigger = false
		P.Touched:connect(function(Hit)
			if Trigger == false and Hit.Parent.ClassName ~= "Accessory" and Hit.Parent ~= c and Hit.Name ~= Player.Name.."Projectile" and Hit.Parent ~= workspace.AntiMouse.FX then
				Trigger = true
				P.Anchored = true
				PFX.Enabled = false
				game.Debris:AddItem(P,1)
				for i=1,3 do
					local FX = game.ServerStorage.FX.CustomMeshFX:clone()
					FX.Color = Color3.fromRGB(255,255,255)
					FX.CFrame = P.CFrame
					FX.Parent = workspace.AntiMouse.FX
					game.Debris:AddItem(FX,2)
				end
				local Reg = Region3.new(P.Position-Vector3.new(6,6,6),P.Position+Vector3.new(6,6,6))
				local RTable = workspace:FindPartsInRegion3(Reg, c)
				for i,v in pairs(RTable) do
					if v.Name == "HumanoidRootPart" and v.Parent:findFirstChild("Humanoid") and v.Parent:findFirstChild("ProjectileDeb") == nil then
						local Deb = Instance.new("BoolValue")
						Deb.Name = "ProjectileDeb"
						game.Debris:AddItem(Deb,0.2)
						v.Parent.Humanoid:TakeDamage(5)
						local debounce = false
						end
				end
			end
		end)
		
	end
end)

Check it with a variable

Player = game.Players.LocalPlayer
repeat wait() until Player.Character
c = Player.Character
mouse = Player:GetMouse()

mouse.TargetFilter = workspace.AntiMouse
UIS = game:GetService("UserInputService")
Cooldown = false --Setting up a variable for cooldown.

UIS.InputBegan:connect(function(input, isTyping)
    if isTyping then return end
    if input.KeyCode == Enum.KeyCode.Q then
    if Cooldown == false then --Checking if there is no cooldown active.
	Cooldown = true --Setting it up so the cooldown is active
         script.Function:FireServer("Projectile", c.HumanoidRootPart.CFrame, mouse.hit.p)
	wait(2) --Waiting until setting cooldown to false change 2 to how ever many seconds.
	Cooldown = false --Setting Cooldown to false so user can use spell again.
        end
    end
end)

Change the wait time.