So, do i need to make a new (newbie) account in order to sell my old account?
Probably too late for that. You've already expressed your intention and you've already been 'tagged' by Chris! (check your trust). This reduces the value of your account, as most signature campaign managers wouldn't accept newly bought accounts (they can't judge post quality knowing that posts were made by different person).
heh Inetersting reaction.. I mean @Chris reaction.. How he can know that OP want to sell this account? He might as well have a few accounts ..