Need help

[Stratos]

I want to convert one of the existing minor factions into ARAGON faction, so I can start on Aragon province and made my own Total War. I though that will be enough to use the Spanish troops, so only need to change the starting place and the flags.
Exist any tutorial to do this??

P.S. I have MTW2 and Kingdoms expansion

Thank's!!

[alpaca]

This should go into the modding questions forum.

Please have a look at the links section (https://forums.totalwar.org/vb/local_links.php?catid=136#linkid471) and read through all the tutorials on adding factions and on adding units because you'll have to do both.
If you still want to do it after that, you're invited to ask questions along the way.