I'm working on a long-term campaign I'll be running for a group of roughly six players. Everybody will be starting as first level human commoners from rural Taldor who get swept up into the plot of a supernatural creature from Irrisen who's stalking and killing his way through the divine casters of the world in order to prepare himself to go through the Test of the Starstone and hunting his true prey: Golarion's gods.
Thus far, as I have the campaign laid out, the PCs have an ally on the Burning Mother who can occasionally guide them, and they will eventually have to meet with. Otherwise, the PCs will likely be hunted as potential werewolves.
I have the plot worked out that gets them as far as Oppara (unless the PCs go a different way), but I fear I don't have a good idea where to go after that; I'm also not quite sure how to incorporate having the PCs learn class levels (which will replace their commoner level[s]).
Any advice from people more familiar with the Golarion setting? I'm trying to read up as much as I can before I start (fortunately I haven't set a start date with players yet), but I have so many options I'm not quite sure how to narrow the options.
Thanks!