Well when I become one, I'll let you know how I did
I believe they are chosen, if I am not mistaken...
but here are a few steps..
Read , know and undertsand the rules
Respect others
Be open minded
Be helpful
Utilize your resources( use the search because 99% of the time any questions you have, have already been addressed)
Give Karma
So if that doesn't help you become a moderator, at least you will be a good member :-D