Definitely signup with Copeac, Azoogle, CPA Empire or one of those other ones. Clickbank, I feel, is very overly saturated, and not the best place to get great offers of some type (i.e. zip code and email submit, click leads, etc). WAY too many f'n e-books and other useless crap in there.
Do your own research and see what you learn and go with what is most comfortable to you.