Fairly new to this game and got questions

[desert]

1. Baktria.
2. I don't really understand what you are asking. Arche Seleukia is Greek. There is no Persian faction, although you could say that Pontos and Hayasdan are sort of Persian (they were once part of the Achaemenid Empire).
3. Rome and Carthage are probably the easiest factions, and you get good money from the start. The easiest Greek faction is probably the Ptolemies, because they are stable, have a good amount of land to draw income from, and .
4. ???
5. The AI is pretty retarded. Exploit that fact, use it to your advantage. Don't attack head-on of course (sounds like that's what you are doing to me; am I wrong?).
6. Large empires were historically hard to control.
7. You can use shieldwall in BI-EB. RTW and Alex EB have no shieldwall, because regular RTW and Alex don't have shieldwall.
8. Certain cavalry units in EB can destroy elite phalanxes with frontal charges. I suggest you read the cavalry guide. Anyway, all factions generally have good infantry, but the non-steppe European factions usually have the most to choose from when it comes to infantry.

Cavalry Guide: https://forums.totalwar.org/vb/showt...=using+cavalry