you can copy and paste this into another forum if you like. But here are your answers.

a) Yes there are clans/guilds in the game its called a linkshell. And while it doesn't seem very important early on in the game, it gets much more important and says a lot about your character as to what linkshell you are in.

b) there is currently no PvP, but apparently it is created but not implimented. They need to find a way to work it into the story... right now PvP make little to no sense as far as the storyline is conscerned.