This is a scam i used a while ago and made some money off of it.
It requires a little patience and the more money you have the easier it is!
First off, try to make a lvl 19 29 or 39 twink, prefferably a lvl 39 because the twink items cost more.
(you do not need to do this but it will make the scam more legit)
Secondly, go to the AH(auction House) and find an epic item.
Bow of Searing Arrows - Thottbot: World of Warcraft (LINK TO THE ITEM)
For example i used Bow of Searing arrows, the best lvl 39 hunter twink item you can get.
Look at the AH price and buy it BUT MAKE SURE THERE ARENT ANY OF THE ITEMS BUT THE ONE YOU ARE BUYING IN THE AH!!! (PS: you don't have to buy an twink item, any epic will do)
thirdly, buy it then sell it back in the Ah for a higher price. (EX. buy bow of searing arrows for 150g, put it in for 200g.)
Next, Log onto a DIFFERENT character and spam trade chat or any chat saying WTB (ITEM) (the item you put in AH) For X GOLD. (Make x = more than the price of the item) (EX: WTB Bow of searing arrows for 240g! PST!)
If you do this correctly, someone will whisper you saying i have one and ill sell it to you for 240g! but they wont acually have the item they will check the AH and see that the price is 200g, buy it then try to sell it to you. BUT FOR THIS TO WORK YOU NEED TO MAKE SURE THEY ACUALLY BOUGHT THE ITEM AND ARE TRADING IT TO YOU!!!! WHEN THEY ARE TRADING IT TO YOU NEED TO LOG OUT AT THE SAME TIME, LOG ONTO THE CHARACTER THAT PUT THE ITEM IN THE AH, COLLECT THE GOLD, LOG OUT AND DELETE YOUR OLD CHARACTER!!!(