Welcome to the forums.
There are like... half a dozen threads on this in these forums about this same topic. If you can't find good info on it... learn2read, srsly.

Unless you really want another L70 Paladin, then I suggest you just take your L70 mage and boost your 4x L15 Shaman up as high as you can, then swap in the L70 Paladin and boost them more.


Also do make sure that all the accounts that you are playing are in your own name, same contact info, etc. Otherwise you'll be very sad someday.