Not understanding something is okay! That’s what asking questions are for. 
Research can be time-consuming, though. And no representation is better than non-researched representation, imo. But if you’re still interested in adding a NB character, here are some helpful threads around the forum you might want to take a gander at:
Differences in Portrayals of NB/Trans/Cis Characters
Non-human nonbinary characters
Oh, and good luck with End of an Empire. The setting sounds pretty neat, and I like the idea of trying to stop the decline of a beleaguered nation. Playing one character that leads to another is also an interesting concept.