LOTSA horse archers, and think cheap, only peasents for garisons, takes Pharaaspa ASAP, wait till the Seleucids are at war with the eggies, armanians and pontus (or at least till they have a few enemies) before going after Seleucia. Watch for opportunities to attack when there are few armies present on your front. When you have to fight the eggies, pray, and hope you can afford some cataphracts (sp).

note: I have only ever played them once, VH/H, kinda quit after fighting Egypt for 50 years with NO advancement by either side.