well... do you need more info about the new
interface or the new
rules? both of these have changed from the other bioware games. did you play IWD2 wich also uses the new rules but the old engine?
the best way to learn the basics is the prologue which is an excellent tutorial. reading the manual wont hurt either.
for more details, you can try the nwn section of ironworks here
http://www.tgeweb.com/ironworks/neverwinter/index.shtml or the sites
www.planetneverwinter.com and
http://www.gamebanshee.com/neverwinternights/