You need to learn correct grammar. You also need to learn what a GM does, they dont help players work on instances, they help players with technical and account difficulties.
Grammar mistakes:... how about I just rewrite the whole paragraph so you can just use it when you apply on other servers.
Nick: In Game Not in Server yet
Age: 16
Gender: Male
Live in: Florida
Experience: Since the beginning of wow my brother was a GM for Blizzard I know every command for Antrix, Ascent, and Mangos.
On what server?(Antrix, ascent, Mangos etc): All
What is a GM supposed to do: Help players work on instances, raids, etc and listen to the admins.
What cannot a GM do: Ban or kick player unless necessary or treat the players badly. You also cannot abuse the GM commands
Why should we choose you: I'm experienced, nice and Ul(I'm not sure what this is supposed to be.) Like me cheers
Other things:
So i don't think this is really a 'must see' GM Application.