https://forums.totalwar.org/vb/showthread.php?t=37343 ~ This guide explains a little bit about how the unit files are setup.
https://forums.totalwar.org/vb/showthread.php?t=38858 ~ You might also be interested in Caligula by GodsPetMonkey, which is a GUI unit editing program for RTW.
Well, good luck with your new unit.
Something else that you might find interesting is the Extended Greek Mod, which was basically designed to add units to the Greek factions.
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