Hmmm, nothing in the quest log after having the vial of blood and after dialog with Vartugg.. It *should* run through a dialog where you need to visit the unholy arc and place the vial.. As to having a agreement with Lord Davenmoor.. well, he will never get that - basically you disappoint him and he comes up with these other tasks to perform.
As far as the guilds are concerned..
Note that you cannot pick-up any class (but guild of mystery classes) in Skulldoon (which was the point of my link, i.e. that the guildmasters for the mages guild are not in Skulldoon.)
As for the structure of classes:
You can start the process on becoming a guild member for 2 out of the 4 basic guilds: Celestial, Fighter, Mage, and Mystery.
The Eastern Houses and the Sisterhood can (and to an extent, must for the eastern house) be quested for.
On top of that are the class selections you make, which can be found here:
http://www.gamebanshee.com/dungeonlords/classes.php
If you want further help here you would need to state what classes your character has.