yes
You don't need to you just use your battle my account name and it merges for you.
Once you have merged your WoW account with battle.net your username and password is the same as your battle.net username and password. For example my username is now my email address "*********@yahoo.com" and my password is the same as my old wow password which you can change at any time at the battle.net website.
If you mean merging 2 wow accounts so all the characters are available from 1 account, that is not possible. It is, however, possible to merge up to 8 WoW accounts under a single Battle.net account. You can do this by going into your Battle.net account and adding your second WoW account to it. This can only be done if both accounts are registered under the same name. You will still have to log into an account separately to access different characters, but you can start up WoW twice, and log in to a different account with each session. Addendum:The above answer isn't correct. You can certainly merge 2 accounts as long as your name is registered to both. The only exception to this I believe is if one of the accounts belongs to a minor over whom you have guardianship.
Generally speaking, no. Once you merge you WoW and Battle.net accounts, which everyone MUST do, there is no going back. There are exceptions, like if you want to unmerge one account and link it to another account that you own. But for this, you would need to call customer support, and they would help you.
No, once a trial account has been upgraded to a full account, you can not go back to using it as a trial account. If you want to do another trial account, then you need to sign up for a whole new one.
Your account can be merged once with BattleNet. Different accounts need to get merged separately. If you're talking about transfering your characters to another account or server, you can do so as much as you want but you still must pay the $25.00 USD.
You can purchase a WOW account on the Internet from a website that sells it or from a person that is selling their WOW account. ArmoryBids, and Buymmoaccounts are two good websites that sells WOW accounts.
No, while multiple WoW accounts can be registered under a single battle.net account, payments must be made for each individual subscription, not based on the account they are attached to.
The cast of On the Pow-Wow Trail - 2008 includes: Glen Begay as Glen Begay
I have a account i can have yeah
Trading WoW accounts is against the terms of service of Blizzard. Also, the original owner of the account can get it back by contacting Blizzard, meaning you would then lose any effort you put into it, or ban the account altogether.
It is against the terms of service to sell a WOW accounts. It is highly recommended that you do not buy a WOW accounts as this could lead to the account getting banned.