I've been working, at least as much as I can, with this fantasy story. I have the characters and plot figured out for the most part. I've developed the setting to a point. I have the backdrop of the main continent (it's based off of The Warring States of Era of Japan), have the major deities and major plot related historic events and some landmarks. But when I look at some of the word building tips online, there's SO much more and a lot of it at least in my view is arbitrary and stuff that won't even be brought up in the main plotline. So I guess my question can I start writing with the setting stuff I have so far or do I need to put more into the setting before I start?