Afaik trade Caravans are for Nomads, build roads your "civilized"^^

Macedon and bactria have a reform tied to the March of time event: Reformed Pezhetairoi(mak) and Late Bodyguard(Bak).
Carthage has a reform which you can read in the FAQ
Epeiros has pretty much similar units to Macedonia just with early access to Illyrian instead of tracian units and the chance to get elephantes very far north/west, and you "can" expand towards Italy