No, you can not have more than one battlenet account on one licence of World of Warcraft. You can however, have more than one licence of World of Warcraft on each battlenet account.
One can purchase max level World of Warcraft accounts from a site that offers the services of selling World of Warcraft accounts. One example includes "BuyMMOAccounts".
Yes, you need a Battle.net account to play World of Warcraft. A while ago Blizzard required that all World of Warcraft accounts be merged to Battle.net accounts.
World of Warcraft doesn't have an adresse, but Blizzard Entertainment does.
Blizzard recently required all world of warcraft accounts to be upgraded to Battle.net accounts. The upgrade is free and takes only a few minutes. Try upgrading your account and see if that helps.
World of Warcraft usernames are the email addresses that you used when you signed up. WoW accounts no longer use just single user names as all WoW accounts must be battlenet accounts.
No. Blizzard does not delete accounts on World of Warcraft.
World of Warcraft trial accounts do use the Cataclysm maps but you would not be able to access them as you can only level up to level 20 in the trial version.
There are no trusted sites to sell World of Warcraft accounts. Besides, you are not allowed to sell it. If you no longer wish to play World of Warcraft, then just stop playing.
ANY place that buys or sells World of Warcraft accounts is not legit. Buying and selling World of Warcraft accounts is against the AuP and ToS that everyone agrees to when they install, patch or upgrade the game. There is no site on the internet that can legitimately sell a World of Warcraft account.
Yes, you have to pay for world of warcraft, it's $15US a month. Discounts available for multiple months payment.
One can make an account on World of Warcraft by visiting the official World of Warcraft website and following the links to create an account. One can have an email address with them.
ANY place that buys or sells World of Warcraft accounts is not legit. Buying and selling World of Warcraft accounts is against the AuP and ToS that everyone agrees to when they install, patch or upgrade the game. There is no site on the internet that can legitimately sell a World of Warcraft account.