I am thinking about selling my world of warcraft account?

I don't know if I am forsure yet, but if I do how much should i sell it for I have 2 lvl 70 human toons (priest/shadow, mage/fire) and many other lvls 65 hunter 51 mage 32 druid........... much more but if anyone knows how i should go by selling them let me know and how ... Thanks