Chat Guide: Basics - Goes over chat etiquette, channels, emotes, lists of active chat moderators, as well as chat commands and shortcuts.
Helpful Links
Web Pages
Paradox Collectors - A site that lists things players usually buy/sell/trade. Remember, it isn't always a bad idea to list under the higher paying guy, some people don't mind paying/receiving less if the person responds fast, so get on this site even if someone is already paying/accepting more for that item than you are willing to pay/accept!