Need help creating a faction

[Chubbs70000000]

Hey there everybody, I came here a little desperate for some help in my ventures to create my own custom multiplayer mod. More specifically i require assistance on how exactly to add new factions to the multiplayer with my own custom units. I've already created breeds, skins, ect for my new faction units, but have no idea how to add these factions to the multiplayer. I would be so greatful for anybody offering any help they can on the subject matter and i deeply appreciate it. Thanks a ton for reading

-Chubbs