http://www.blizzard.com/support/wowcompacc/

All the info you need is there. If you are not sure of the country codes etc, use http://www.countrycodes.com/

And go search for more info from Blizz's site, I found so much info from the forums as well as the in-game support page. If you truly want to save your account, there is work to be done and don't expect it to come back by asking us stuff, you need someone working at Blizzard now to help you.