Custom Leaderboard Help?

I want to make a custom leaderboard that shows everyone's name going down. sorta like this :

http://ftg.operationsupplydrop.org/wp-content/uploads/2014/11/2014-11-10_00004.jpg

I have the guis for the right side but Idk why this isnt working. I want the player's name to be on those lines. How would this work for multiple players? I dont want the same player name to be showing up. This is the script I have so far.

leader = script.Parent -- this is a text button
local Players = game:GetService("Players")

function onPlayerAdded(player)
     print(player.Name)
leader.Text = (..."Player.Name"...)

end