As far as Imperial NPC assets for Apaolo and I, I tend to treat that stuff as back ground noise and focus on the PC to PC interaction. Nameless NPCs in my experience tend to turn the RP into a dick measuring contest. So if we ever get to the point there we need to have some stormtrooper action it will be as nothing but white noise behind our interaction with the other characters.

As for the Rebellion, this RP takes place two months after Order 66, which was in 19 BBY. The actual Rebel Alliance didn't get established until 2 BBY. So we are still years away from the Rebellion we know and love. However it is still an early period of unrest with many little rebellions cropping up. An idea you might want to bring in as a major group of contention towards the Empire in this RP is Rham Kota's Militia. They were active in this time frame.