I was wondering if anyone here is a "professional" information broker, and if so, could you provide some tips on how to get started (where to make connections, how much information is worth, etc). Sorry if this question has already been asked or if it's kind of dumb, but I'm interested in this particular field. Any help would be appreciated.

Read the faq.
best first step. But no,im not an info broker (Not like others there who've tried hard to look like one.-_-)
it can be find somewhere. I dont know the exact page, but keep on looking at every boards and threads.