Try the FAQ stickied at the top of this forum; it will answer some questions. The game manual answers many questions, and the manual addendum answers some others... the addendum (and other downloads) are here:
http://www.shrapnelgames.com/Illwinter/d2/6.htm
The sticky "Dominions II links" thread also has many useful links. Arryn's site, for example, probably contains all of the fan-made resources you might want...