You need to buy another account.

1. Do recruit a friend to your e-mail address via the account with the best character on it. (You will use this character for powerleveling through instances)
2. Create a trial account using the key that is sent to your e-mail address
3. Buy an account code, or a new retail box and apply it to the trial account you just created (YOU MUST CREATE THE TRIAL ACCOUNT WITH THE KEY SENT TO YOUR E-MAIL ADDRESS IN ORDER TO GET RAF)
4. Level solo to lvl 10 or ~20 (unless you want to do ragefire chasm)
5. Power level yourself through DM > Stocks > SM > Uldaman > ZF etc until lvl 60

Also, when you hit lvl 60, you will have 30 levels saved up that you can grant to an alt on your main account. So, go level a character to lvl 30, and then BOOM you are lvl 60 once you apply the levels.