Hmm, I haven't played them much, but as I remember, they have decent heavy infantry (hypaspists and hoplites) and some nice javelin throwers (peltasts). But the javelin throwers on fire closest on the front line, back them with heavy infantry on attack closest just behind, and you have the making of a decent army for the starting game The javelin will act as softeners and shock absorbers for your heavy infantry, which should have a very good survival rate (not so the throwers, but they are cheap). Forget the slingers, the cavalry and the cardaces. When you have the money, you can try elephants, but they are tricky to use : you must plan for them to rout, and leave the way open, or you will feel the pain
Also, you need at the very least 5 of them, a little back so they are not the first target of archers, or they will never get to the enemy before routing...
Remember that your priestess can heal afflictions.
Later, you will need to use their mages, but I can't help you there, I have never gotten that far.