Take a look at what's going on, at The Town Crier!
Underneath the radar map of the area. I didn't include map_fog and map_trade_routes.Note to map_features: I left the coastline layout in case you want to add more rivers - for use simply fill in the background with black (RGB 0,0,0)There is no real order on how to progress with the map, but the first step would be to make it playable. With a map this size you will need about 12-15 evenly sized regions, 2 factions with a named character each and the slave faction. When creating those regions it's advisable to give them their correct names already, eg. Latium for the whole of Italy with Roma as settlement. That way you later just have to resize the region without changing anything else.Allocate one region to each faction, the rest to the slaves. Once the map works start working on ground_types and climates.Once it look's to your satisfaction create the final regions and place trading resources, sort out the development details of settlements and add characters.
That would be good if we didn't had hardcoded limits like 199 provinces, 21 factions and 7 cultures. With that map, the provinces would be way to big and the rebels would hold most of it. The original map seems to be the best compromise.