Agent Orange

I have a question for all you writerly types out there. I'm thinking about looking for an agent. I feel like I finally have enough stuff completed to give someone an idea of what I do. Problem is, I have no idea about how to find a decent one or even where to start, or what to avoid like the plague. I really don't know if I should even bother with one at all.

Thoughts or advice, anyone? I'm going to screen comments, so you can keep your answers between you and me if you like.