Trying to make a slider bar for my game, haven't seen a good way

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1

So I’m basically trying to create a slider bar for my game. I haven’t found a good example that I could learn from. I was trying to use GetMouseLocation to get the location, but this only prints in pixels. How would I make this work for scaling, and how would I get what I want after this?

I know I don’t have a lot to go off of right now, I’m very new to UserInputService and everything related

Here's the script 
local frame = script.Parent
local player = game.Players.LocalPlayer
if player.Name == "Derpee_Kirbee" then
	frame.Visible = true
else
	frame.Visible=false
end


local UIS = game:GetService("UserInputService")
local sliderButton = script.Parent.SliderImage


sliderButton.MouseButton1Down:Connect(function()
	print("Mouse Clicked over Button")
	print(game.Workspace.CurrentCamera.ViewportSize)
end)

UIS.InputEnded:Connect(function(input,processed)
	if input.UserInputType == Enum.UserInputType.MouseButton1 then
		print("Input ended")
		print(UIS:GetMouseLocation())
	end
	
end)