I don't necessarily mean that you shouldn't look on craigslist ads for lawyers. If you think that's the best way for you to actually find a lawyer, and you don't know anybody else in the whole wide world who's ever known anyone who's had a lawyer or used a lawyer or thought about a lawyer...
but seriously. Don't post on craigslist asking a legal question and looking for a lawyer. In addition to the desperate people who might message you back, there are also scammers and spammers. And those people might, just might, be convincing enough over email to take advantage of you. The lawyer-client relationship is a fiduciary one, and you can't afford to be taken advantage of precisely when you're vulnerable. (You are vulnerable, otherwise you wouldn't be looking for a lawyer).