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)