How can i make a preview of what i am placing?

Before you copy and paste the code: create two RemoteEvents on Placement.Remotes, one named "MovePreview" and the other "CreatePreview". At least try to understand what I wrote. Its quite a big Code:

Server Script Code:

local place = game:GetService("ReplicatedStorage").Placement.Remotes.Place
local movepreview = game:GetService("ReplicatedStorage").Placement.Remotes.MovePreview
local createpreview = game:GetService("ReplicatedStorage").Placement.Remotes.CreatePreview

function newPlayer(player)--Create a Value inside the player that shows what is the currentpreview
	local currentpreview = Instance.new("ObjectValue")
	currentpreview.Parent = player
	currentpreview.Name = "CurrentPreview"
end
game.Players.PlayerAdded:Connect(newPlayer)

function onPreviewDeleted(obj,target)--Sometimes ObjectValues hold values of instances that got destroyed
	if obj == target.Value then
		target.Value = nil
	end
end
function findPartOnRayCheck(camerap,mousep,currentpreview)
	local ori = camerap
	local dir = mousep
	local ray = Ray.new(ori,(dir-ori).unit*999)
	local ignoreList = {currentpreview}--Ignores the CurrentPreview so I cant move over itself
	local part, rayposition = workspace:FindPartOnRayWithIgnoreList(ray,ignoreList)
	return part,rayposition
end
function movepreview(player,camerap,mousep)--Moves the Preview
	if camerap and mousep and player:findFirstChild("CurrentPreview") then
		local currentpreview = player.CurrentPreview.Value
		if currentpreview then
			local part,rayposition = findPartOnRayCheck(camerap,mousep,currentpreview)
			if part then
				if currentpreview.PrimaryPart then
					currentpreview:SetPrimaryPartCFrame(CFrame.new(rayposition))
				else
					currentpreview:MoveTo(rayposition)
				end
			end
		end
	end
end
game.ReplicatedStorage.Placement.Remotes.MovePreview.OnServerEvent:Connect(movepreview)

function createPreview(player,building,mousep)--Creates the preview
	if building and mousep and player:findFirstChild("CurrentPreview") and player.CurrentPreview.Value == nil then
		local currentpreview = player.CurrentPreview
		currentpreview.Value = building:Clone()
		workspace.DescendantRemoving:Connect(function(obj) onPreviewDeleted(obj,currentpreview) end)
		local parts = currentpreview.Value:GetDescendants()
		for i=1,#parts do
			if parts[i]:IsA("BasePart") then
				parts[i].CanCollide = false
				parts[i].BrickColor = BrickColor.new("Bright red")
				parts[i].Transparency = .5
			end
		end
		currentpreview.Value.Parent = workspace
		if currentpreview.Value.PrimaryPart then
			currentpreview.Value:SetPrimaryPartCFrame(CFrame.new(mousep))
		else
			currentpreview.Value:MoveTo(mousep)
		end
	end
end
game.ReplicatedStorage.Placement.Remotes.CreatePreview.OnServerEvent:Connect(createPreview)

game.ReplicatedStorage.Placement.Remotes.Place.OnServerEvent:Connect(function(plr,building,camerap,mousep)
	local previewpos = nil
	if plr:findFirstChild("CurrentPreview") and plr.CurrentPreview.Value ~= nil then--Destroy Preview, as it wont be used anymore
		local part,rayposition = findPartOnRayCheck(camerap,mousep,plr.CurrentPreview.Value)
		if part then previewpos = rayposition end
		plr.CurrentPreview.Value:Destroy()
	end
	if not previewpos then previewpos = mousep end
	if previewpos then
		--Why would you create a local position2 = position?
		local building2 = building:Clone()
		building2.Parent = workspace
		if building2.PrimaryPart and previewpos then
			building2:SetPrimaryPartCFrame(CFrame.new(previewpos))
		else
			building2:MoveTo(previewpos)
		end
		--return building2
	end
end)

Local Script Code:

local player = game:GetService("Players").LocalPlayer -- Define the player
local mouse = player:GetMouse() -- Define the mouse
local UIS = game:GetService("UserInputService") -- UIS for activate of placement
local active = true -- Is placement active?
local activekeycode = Enum.KeyCode.E -- When the player presses E, they start placement.
local event = game:GetService("ReplicatedStorage").Placement.Remotes.Place
local changeevent = game:GetService("ReplicatedStorage").Placement.Remotes.ChangeBuilding
local currentbuilding = game:GetService("ReplicatedStorage").Placement.Buildings.Model
local camera =  workspace.CurrentCamera

UIS.InputBegan:Connect(function(input, gp) -- I don't think this works right now, maybe i'll fix it soon.
    if input == activekeycode and gp and active == false then
        active = true
    elseif input == activekeycode and gp and active == true then
        active = false
    end
end)


mouse.Move:connect(function()game.ReplicatedStorage.Placement.Remotes.MovePreview:FireServer(camera.CFrame.Position,mouse.Hit.p) end)
mouse.Button1Down:connect(function()game.ReplicatedStorage.Placement.Remotes.CreatePreview:FireServer(currentbuilding,mouse.Hit.p) end)

mouse.Button1Up:Connect(function()--Start the placement
    if active == true then -- Ensure it is active
		print("Activated")
		local building = currentbuilding
		--local position = mouse.Hit.p -- Don't know if i should use "mouse.Hit.p" or "mouse.Hit"
		game.ReplicatedStorage.Placement.Remotes.Place:FireServer(building,camera.CFrame.Position,mouse.Hit.p)
		--local building = game.ReplicatedStorage.Placement.Remotes.Place:InvokeServer(building,mouse.Hit.p)
		end
	end)

changeevent.OnClientEvent:Connect(function(building)-- Change Building
    if not active == false and building ~= currentbuilding then -- Ensure it is not active
        currentbuilding = building
    end
end)