Re: Bosporan campaign .. no1
I think this will be harder as you go further, it's pretty easy to take out the first two settlements near you (which is the 3rd you took TTrouble?) and you can build up a nice set or armies but then you have some awkward choices.
Go North against the rebels and Sarmatia but the distances are huge so you'll probably spend a lot of time chasing down and I bet for very little economic gain. South-West against Scythia but you'll end up bumped against Macedonia, Dacia and Boii at least which is going to be fun. South-East down the Caucasus towards Pontus/Armenia which is probably going to be hard too.
The unit balance is a good mix though with decent infantry and good cavalry from light, through HA, lancers and heavy so you should have the capacity, it's the starting position that makes it interesting.