First of all, you need to know at least 2 big WoW trading sites. I use ebur and markeedragon.com
Now you need to find people on one of sites that want to trade accounts and dont seam much expirienced in trading (trade count low or no or low rep).
Go to other site and find profile page of your favourite middleman (or best repped one on site)
Simply click File->Save page as... on your web browser and save the page on your computer. Now open it in any html editor and change the contact info of the middleman to some of your contacts.
Upload it to your free hosting service (try to make adress look as much possible to the original adress).
So now you go to OTHER site and hope to find someone who never heard of first site...
Here is example of a trade. I made profile page of famous ebur moderator/middleman, and i went to markeedragon.com to find a victim
ME: Okay, i really like your (lock/drood/whatever), i want to trade
VICTIM: Okay
ME: So know any good trusted middlman?
VICTIM: Well, not really (or if he says yes, 99% of ppl offering middleman services on markeedragon is doing that for money, you can just say to him you dont want to pay for middleman, there is another wow trading site where ppl are middlemans only for positive feedback/rep)
ME: Well i dont usually trade here, i spend more time on ebur, i can get us a middleman there, he will do it for free,i will link you his profile, he has 150+ trades and most rep on the site
VICTIM: Okay, sure
ME: - SlayerX and Ommi's - Free Middleman Service -, check his profile and tell me if you are OK with him (THIS IS MY FALSE PAGE I edited it so it shows my contact info instead of middleman's, and uploaded it on my awardspace. Note all the links on the page still works, if he clicks out, he will be prompted username/pass)
VICTIM: kk, he seems trusted
ME: kk, i will invite him to conversation now
VICTIM: okay
Now the trick on how to run 2 MSN messengers from same computer. You cant have 2 clients running different MSN accounts, but you CAN go to meebo.com and log on one msn account from there, while other one is runned on your MSN client on desktop
Join conversation and pretend to be middleman, take suckers info and gratz! you got new acc
Note: I know this sounds too easy, but it worked 3/5 tries i made today. One of those tries was even my mistake (logged on wrong MSN lol that is known as scammer and contacted victim)
Hope this helps someone. Enjoy your scamming