Ok first you want to start a trade with another person. Simple, best if done off of the Wow servers so its nearly impossible to track by GM's or what not. Next you want to exchange the info tell them they you will go first (Opens them up) and give them your info and then ask for the e-mail to link your previous account to, get there info and give them your email, tell them the accounts linked to there email and wait for them to link theirs to yours (Order here is unimportant go first if ya want)
~ But Make sure you do not link their email to your account if all goes well you now have two accounts and there both linked to you. If the other person asks why its not showing up on the account info page just tell them it usually takes a few hours to update or something like that. ~
Simple yes but it works, Thats how I lost my first account.
Best of luck
Lobeau