How to make roblox wait for local player?

So I have a script that works fine while It's in the players startergui, it creates a giant laser that moves around and kills anyone it touches, the problem is I want it to start off in the workspace and then be moved into the local players startergui. For some reason, while it's not already in startergui, I get an error that says "Workspace.Script:3: attempt to index local 'player' (a nil value)". I think it's because Roblox hasn't loaded the local player yet. Can someone Please tell me how to fix this issue!?

Script:

-- Get the player, character, and the players gui
local player = game.Players.LocalPlayer
local char = player.CharacterAdded:wait()
local hum = char:WaitForChild("Humanoid")
local gui = player:WaitForChild("PlayerGui")

-- Delay
	wait(1)

-- Parent the script to StarterGui and set the properties of wall
	script.Parent = gui
	wall = Instance.new("Part")
	wall.Name = "wall"
	wall.Shape = "Cylinder"
	wall.Rotation = Vector3.new(0, 0, -90)
	wall.Anchored = true
	wall.Size = Vector3.new(400, 8, 8)
	wall.Transparency = 0.7
	wall.Color = Color3.new(255, 0, 0)
	wall.CanCollide = false
	wall.Material = "Neon"

	wall.CFrame = char.Torso.CFrame + char.Torso.CFrame.lookVector * 5	
	wall.CFrame = wall.CFrame * CFrame.Angles(0, 0, 1/2 * math.pi)	
	wall.Parent = game.Workspace
	
-- Move the wall
	for i=1, 500 do

		-- If the wall hits someone, kill them
		function hited(hit)
			local hum = hit.Parent:FindFirstChild("Humanoid")
				if hum then
					hum.Health = 0
				end
			end
		
		wall.Touched:connect(hited)
		-- Set the walls position
		wait()
		wall.CFrame = wall.CFrame + char.Torso.CFrame.lookVector * 5 + Vector3.new(0, 0, -1)		
					
		-- Destroy the wall eventually
		if i >= 500 then		
			wall:destroy()
		end
		
		-- If you get killed by the wall, it removes itself
		if hum.Health == 0 then
			wall:destroy()
		end
	end

The problem is that Local Scripts only work in certain areas. The local player can only be found inside the Player, but Workspace isn't a player so it returns 'nil' as a way of saying "Hey I am not inside a Player!"

Instead of using LocalPlayer...I would just do a regular script in the workspace with the 'PlayerTouched' event... it will give you the player touching the wall so that the event automatically sets wh touched it.

Hope this helps!

repeat wait() until game.Players.LocalPlayer