there isn't a tutorial on 'create a faction' because that isn't actually the way you do it...
you need to decide which one of your factions is redundant, and then gradually change them into what you want the new one to be.
you need to look for individual tutorials for each of the sections you'll go through, like;
'change faction name'
'add / remove units from faction'
'change faction's starting position'
'create new banners'
'create new faction icons'
'change character names'
'change character traits'
start with something easy like changing the name, and look through the tutorials from the index here
https://forums.totalwar.org/vb/local_links.php?catid=70
especially factions and units sections.
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