You can either make some new accounts, minimum would be 3 new accts, then transfer toons from 3 existing accounts to the new ones, and enjoy RAF, and just let the other 3 old accounts expire. Or, you could get one new account, RAF it with an existing account, then level up a shitton of pairs of toons, and just character transfer them to your other accounts. Either way, you have to make brand new accounts (with Wotlk if you want to go up to 80)

Ask yourself, what to you have more of, time or money?