How to use tween service in InputBegan and Input Ended?

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#1 
local fireball = game:GetService("ReplicatedStorage"):FindFirstChild("fireball")

fireball.OnServerEvent:Connect(function(player, mousePos)

	local character = player.Character

	local fireball = game:GetService("ReplicatedStorage"):FindFirstChild("Fireball"):Clone()
	fireball.Parent = game.Workspace
	fireball.Size = Vector3.new(2, 2, 2)
	fireball.CFrame = character:WaitForChild("HumanoidRootPart").CFrame * CFrame.new(0, 10, 0)
	fireball.Massless = true
	
	local TweenService = game:GetService("TweenService")
	local Info = TweenInfo.new(3, Enum.EasingStyle.Bounce, Enum.EasingDirection.Out, 0, false, 0)
	local properties = {
		Color = Color3.fromRGB(255, 0, 0),
		Size = Vector3.new(15, 15, 15),
		Anchored = true
	}
	local Tween = TweenService:Create(fireball, Info, properties)
	Tween:Play()
	Tween.Completed:Wait()
	fireball.Anchored = false

	local bv = Instance.new("BodyVelocity", fireball)
	bv.Velocity = CFrame.new(fireball.CFrame.Position, mousePos).lookVector * 50
	bv.MaxForce = Vector3.new(math.huge, math.huge, math.huge)
	
	
end)

I want to make this into a module that is a tween, so that when I use input began I will tween it and it will get bigger, and when I ended the keypress I will add body velocity on the fireball so it will execute. However, I cant seem to make a module script with tween service and in the UIS.

Thanks for the help in advance!