I may have the wrong impression, but it seems to me that during Napoleon's reign France was at an almost constant state of war, and Napoleon did spend a lot of time campaigning abroad, yet, he still had a country to run, one that was perhaps recovering from the aftermath of a major revolution. How did he manage? Who did he left in charge during his campaigns and how were they seen by the French?
So it's not an answer per say but they are a few post with this kind of subject already :
A few points about what they feel is important in this era :https://www.reddit.com/r/AskHistorians/comments/230s9j/historians_what_would_you_say_is_the_most/
On taxe rate : https://www.reddit.com/r/AskHistorians/comments/399oac/what_would_the_tax_rate_be_in_revolutionary_and/
On nobility : https://www.reddit.com/r/AskHistorians/comments/3qo3ec/what_happened_to_the_napoleonic_system_of/
I hope it give you a bit to look at until you have better answers.