Main Title Gui Help?

Here is a script I made in another post it will stop a character from loading:-

local respawnDelay = 15 -- delay time

game.Players.CharacterAutoLoads = false --Stop character auto load

game.Players.PlayerAdded:connect(function(player) -- new player in the game added

    player.CharacterAdded:connect(function(character) -- character sporns/ re-sporns

        local humanoid = character:FindFirstChild("Humanoid")  -- find humanoid in character

        if humanoid then -- humanoid is found

            humanoid.Died:connect(function() -- add a humanoid died event

                humanoid.Parent:Destroy() -- cleanup character or it will stay in the game

                wait(respawnDelay) -- wait for specified time
                player:LoadCharacter() -- load new character

            end)
        end     

    end)

    wait(respawnDelay) -- delay for new player when they join the game
    player:LoadCharacter() -- load character
end)

To answer your other question you may need to look into a loading Gui like my place. My Place

Edit disconnects player from gui:-

Localscript in the GUI:-

script.Parent.MouseButton1Click:connect(function ()
	game.Workspace.disconnectPlayer:FireServer() --The location of the remove function
end)

In the server script:-

local event = Instance.new("RemoteEvent") 
event.Parent = game.Workspace -- This needs to be somewhere the player can access
event.Name = "disconnectPlayer" 
--You can create the object but decided to create on in this script


event.OnServerEvent:connect(function(plr,msg)  --Player name is passed to the script
    local gplr = game.Players:FindFirstChild(plr.Name) --finds the player in Players
	gplr:Kick()  --kicks the user 
	
end)