Need help with faction mod

[Quintus Dias]

I want to make my own faction mod, basically Rome, the Julii as the main Roman faction, and I want the other 3 removed, SPQR, scipii and also brutti.

I want the lands that they had to belong to the Julii now, including that one part on that island, syracuse, and I still want to have all the generals, like the brutus and scipio families along with the maxentius and julii, I plan on making the maxentius family the faction leaders, but I also want to change what units are in what cities, to add or remove, also I want to add a new army on the map, how do I do it?

So you get my point, right? Can someone give a guide for this cause I really want to do it and I hope it won't take long, also when I do make the adjustments can I launch my mod through some kind of program? When I'd want to uninstall or install it I'd just run the program, help

[Quintus Dias]

I also forgot to say, in southern Italy, you know how you can recruit sammite mercenaries? How do I make it that you can recruit more?

PS: at the begining how do I stop the game from sending me the messages of the destroyed factions if the other 3 roman factions will be destroyed? I mean I kinda want my mod to be like this mod, I'll called it Rome: Total Rome