I am writing three books on the second Persian War (yeah, I'm over-the-top ambitious). Most of the action in my series won't take start until book two. Book one is the set-up for everything that happens in the war, which allows me to introduce characters, places, and the events that lead to the confrontation between Hellas and Persia. However...
I worry about having too many discussions and flashbacks concerning the Ionian Rebellion (which occured at least 10 years before the story takes place and is essential to understanding why Xerxes is on the march). I'm worried that all the war councils and discussions about fighting are boring. I'm worried that my characters lack dimension. I'm worried about the overall layout of the story.
Do I worry too much? Not enough? Help!