when it comes to creating settings built around cultures you're not familiar with, the most important thing to do is to do your research. as dnd is a fantasy game, you're going to want historical and religious context to figure out what fits and what doesn't. Granted, the demands are much lower if you're reserving this for a small group of friends who won't take offense at cultural ignorance, but all the same, doing your own research can lead to better ideas than the uninformed opinions of people like me, and understanding the cultural context behind the setting will show you where and how you can bend that context to tell a cooler story.