How do I fix my Raycasting Gun Script

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I was following Threasto’s Raycasting Gun Video when I saw that the Lazer Thingy isnt appearing when i shoot + the damage doesnt work
(go watch his video if u dont know what im talking about time stamp for it is around 8 minutes ish)

Could anyone help me here?

the script is stored in ServerScriptService
its a RegularScript

--Services
local replicatedStorage = game:GetService("ReplicatedStorage")
local debris = game:GetService("Debris")

--Variables
local remoteEvent = replicatedStorage.ToolRemote
local visualsFolder = game.Workspace.Visuals

--Create Bullet Line Thing (this is the part im having trouble with)
local function createVisual(startPosition, direction)
	local center = startPosition + direction / 2
	local distance = direction.Magnitude
	
	local visual = Instance.new("Part")
	visual.Parent = visualsFolder
	visual.Anchored = true
	visual.CanCollide = false
	visual.BrickColor = BrickColor.new("New Yeller")
	visual.Material = Enum.Material.Neon
	
	visual.CFrame = CFrame.new(center, startPosition)
	visual.Size = Vector3.new(0.5, 0.5, distance)
	
	debris:AddItem(visual, 0.2)
end

--Damage n' Stuff
remoteEvent.OnServerEvent:Connect(function(player, tool, startPosition, endPosition)
	local maxRange = tool:GetAttribute("MaxRange")
	local damage = tool:GetAttribute("Damage")
	
	local direction = (endPosition - startPosition).Unit * maxRange 
	
	local raycast = game.Workspace:Raycast(startPosition, direction)
	
	if raycast then
		print(raycast.Instance.Name)
		
		local hitCharacter = raycast.Instance.Parent
		local humanoid = hitCharacter:FindFirstChild("Humanoid")
		
		if humanoid then
			if hitCharacter.Name ~= player.Character.Name then
			    humanoid.Health -= damage
			end
		end
    end
		
	createVisual(startPosition, direction)
end)
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