Wow... NEVER try to use chariots in a realistic, historical way in Eb. It doesnt work.
But they scare the enemy and are cavallery killers, esspecialy while they are routing (Yes its crazy, but its true^^). So navigate them behind the enemy, atack their cavallery and they are at least decent.

Peltasts are great! They are usefull in melee also.

The hetairoi skirmishers are skirmisher cavallery so forget about them. They are terrible.