I don't know what I really want to do with the adventures but I think there should be ultimately six adventures in the entirety of the Module, all of them crossing over with one another until the final attempted rebirth of Aoskar.
One adventure hook I'm reasonably certain should happen near the end of the Module is "The Factol's Murder."
Basically, after the time the PCs have gotten to know Factol Ombidias and worked for him a few times, they hear word that he's been found slain in his chambers. This was carried out by Dexter (see NPC thread)'s clumsy minion Saross (see Planescape: Torment and the NPC thread).
However, because Saross strongly resembles his similar looking twin sister, the blame has squarely been placed upon Sarossa (see Planescape: Torment and the NPC thread). Saross, being the idiot that he is, wants to get his sister off and get away with his crime despite a description of it.
Thus, the PCs are hired in a murder investigation that will lead them right back to their employer. Ultimately, I think it'd be fun to give the PCs a bunch of suspicious characters to meet with a lot going on under the surface just like the Godsmen murder mystery in Planescape: Torment.
I'm open for any and all ideas for kind of characters and help for this. However, in the end, the PCs will eventually find evidence that proves Saross guilty and hints at the previously unseen presence of Dexter.
Saross, in the end, will never see trial as he's slain by Dexter to cover his tracks.