War of the Burning Sky really should be used in its own setting, or on a new continent of an existing setting.
I've set my War of the Burning Sky campaign in the distant past of the continent of Sarlonna, in Eberron. Check out my story hour for how its gone so far.
However, you could squeeze it into another setting. Basically you all you need is a powerful kingdom dominated by its autocratic ruler, some neighbouring states and a sea coast.
However, since its going to take you from 1 to 20, why not just use it in its own setting?
I think Pathfinder is great, but after Shackled City, and all those Dungeon adventures, I've got pretty used to Paizo's (excellent) style. As a result, I'm finding WotBS a nice change.