I need someboy to add onto my Ranking script not using a group. Please?

Ok so I'm trying to make a simulation game, I need to make a ranking system, but with my poor scripting abilitys I don't know how.

Basically I've got this.

-- Start -- Made By SpinnyWinny
local Rank = game.StarterGui.ScreenGui
Players = game:GetService("Players")
Rank.TextLabel.name = ("Rank")

function onPlayerAdded(player1)
	game.StarterGui.ScreenGui.TextLabel.Text = ("Rank: Loading")
	wait(1)
print(player1.Name .. " Entered")
wait(10) -- Player Loading time. Not exact.
game.StarterGui.Parent = game.Players.LocalPlayer.PlayerGui
wait(0.1) -- Just a bit of momentery loading.
game.StarterGui.ScreenGui.Parent = game.ServerStorage.DONOTREMOVETHISFOLDER
if game.Players.LocalPlayer.PlayerGui.ScreenGui == nil then
    game.ServerStorage.DONOTREMOVETHISFOLDER.ScreenGui.Parent = game.StarterGui
    warn ("Error StarterGui / Player Gui ScreenGui = Nil")
else
	warn ("EndingSession")
	wait(5)
	game.Players.LocalPlayer:Kick()	
   end
end

I've got no idea if this would work or not, But all I really need it to is when certain people (more than 1) Say /Promote (Name)

That it would change a rank on a gui to that rank. And it would give them a certain tool from server storage If anybody can make this work it would be greatly appreciated.

Things that it must do

1. When you say /Promote (Players Name) It Levels them up to a certain rank (Not using a group its a simulation game)

2. I can customise the ranks

3. Every time they rank up it gives them tool(s) (Might be more than 1)

4. Changes there team

5. Only certain people can say /Promote and It work and promote someone.

Sorry for being picky but because my skills are limited and I really needs this done. Thank you, BYE!

Merry Early (1 day for the brits) Christmas!

My scripting is limited to what the rules says. Things that it must do is like giving us orders, I am pretty sure this is a help website not a request.

Also, I found a video on YouTube that in the same topic of yours, Link To The Video