I'd direct a new player to the assitance and not mention marketplace as far too often it's just a rant place and has nothing to do with economy, friendship or even this games success imo. Let them experience the nicer side of the community untill they have their own opnions then introduce them to the trolls. I wont even try to suggest that people rant to each other via tells or another chat room as it's just not worth the headache you recive by mentioning how it might seem inapropriate to a great deal of players to rant in mp. Atleast in assitance everyone there is part of that chat room for the same reason, the games future.
Just my 2 cents and hopefully not taken the wrong way.