Yes, you can resurrect characters in this game with the spell 'Raise Dead'. You'll find it in scrolls, wands, etc. later in the game.
As for the guide, there is no official manual, but probably you can get some help from this review:
http://www.redshift.hu/legacyreview/legacy.htmI hope it helps - if not, just ask and I'll try to answer.
You can purchase all expansions for the game, just write to me for the details (sylon at redshift dot hu).