I know that the faiths forum section had a very thorough section on the various gods in the Forgotten Realms, but may I suggest the following web links be used as the basis for Arvoreen section.
http://nwn2.wikia.com/wiki/Arvoreen (with the references to the Heironeous god which is from the Greyhawk setting omitted)
and
http://en.wikipedia.org/wiki/Arvoreen
because this second link includes information as it relates to the importance of silver and silver weapons in the faith.
The information in the faiths section of the forums is accurate, these two links just expand upon that in greater detail.