I want to make a race game but how?

I used the basic map (racing) from Roblox Studios and I'm done, but my friends tell me that some GUIs are not displayed. Could someone please explain the script to me? What I also try is a leaderboard that shows how many wins and money. If you win in the game now, the win value should increase by 1. so before I won, I still had 0 wins and 0 money but if I win it should then show 1 wins and 50 money

hier ist das skript was ich meine:

local RaceManager = require(391925754)
RaceManager:SetDebugEnabled(false)
RaceManager:SetIntermissionDuration(50)

local function pushNotificationForPlayer(player, message, duration)
    local notificationFrameContainer = player.PlayerGui.RaceNotificationScreen:FindFirstChild("NotificationFrameContainer")
    local notificationFrame = Instance.new("TextLabel", notificationFrameContainer)
    notificationFrame.Size = UDim2.new(1, 0, 1, 0)
    notificationFrame.Position = UDim2.new(0, 0, -1, 0)
    notificationFrame.Text = message
    for i, frame in ipairs(notificationFrameContainer:GetChildren()) do
        frame.Position = frame.Position + UDim2.new(0, 0, 1, 0)
    end
    delay(duration, function()
        for i = 1, 30 do
            notificationFrame.BackgroundTransparency = i / 30
            notificationFrame.TextTransparency = i / 30
            wait()
        end     
        notificationFrame:Destroy()
    end)
end

local function pushNotification(message, duration)
    for _, player in ipairs(game.Players:GetPlayers()) do
        pushNotificationForPlayer(player, message, duration)
    end
end

local function onPlayerAdded(player)
    local playerGui = player:WaitForChild("PlayerGui")
    local raceNotificationScreen = Instance.new("ScreenGui", playerGui)
    raceNotificationScreen.Name = "RaceNotificationScreen"
    local notificationFrameContainer = Instance.new("Frame", raceNotificationScreen)
    notificationFrameContainer.Name = "NotificationFrameContainer"
    notificationFrameContainer.BackgroundTransparency = 1
    notificationFrameContainer.BorderSizePixel = 0
    notificationFrameContainer.Size = UDim2.new(0.3, 0, 0.1, 0)
    notificationFrameContainer.Position = UDim2.new(0.35, 0, 0, 0)
end

RaceManager.RaceStarted:connect(function()
    pushNotification("Race started!", 3)
end)

RaceManager.RaceFinished:connect(function(player)
    local message = "Race over. "
    if player then
        message = message .. player.Name .. " won!"
    else
        message = message .. " Ran out of time."
    end
    pushNotification(message, 5)
    wait(5)
    for _, player in ipairs(game.Players:GetPlayers()) do
        player:LoadCharacter()
        if game.StarterGui.ResetPlayerGuiOnSpawn then
            onPlayerAdded(player)
        end
    end
end)

RaceManager.IntermissionStarted:connect(function()
    local intermissionDuration = RaceManager:GetIntermissionDuration()
    wait(intermissionDuration / 2)
    pushNotification("Race starting soon!", intermissionDuration / 50)
end)

RaceManager.LapFinished:connect(function(player, lap, duration)
    local shortDuration = math.floor(tonumber(duration) * 1000) / 1000
    pushNotification(player.Name .. " finished lap " .. lap .. "/" .. RaceManager:GetNumLaps() .. " in " .. shortDuration .. " seconds", 2)
end)

for _, player in ipairs(game.Players:GetChildren()) do
    onPlayerAdded(player)
end
game.Players.PlayerAdded:connect(onPlayerAdded)