Just make a level 1 character, bring them to Orgrimmar, then spam /Yell, Trade, or General asking for "gold plz" every 10-15 seconds.
Everyone loves it, and you're guarenteed 100g an hour, at LEAST!
Make sure to use the words "lolz" "omgz" "roflcopter" and "n00b" a lot. If anyone yells at you make sure to yell lots of profanity (get creative) and racial slurs (dont miss any) at them to assure that the GM's will know your older and more mature, and will take your side.