I get invites and have read about them, but I am not sure how to choose a Free Company.

What can I expect to get from joining one? And how do I pick one to join? So far, it seems that all I can do is join one, decide if I like it and either stay or leave then repeat as required. That sounds like a crude way to do it.

I don't have a group of friends playing, so other than that method how did you guys choose a FC?