Would you prefer to start the rp from when the cats are loners/rouges/kittypets and slowly develop them into the two clans? Or have the clans recently formed and continue from there?
There is potential for the both of those ideas, but for the sake of simplicity we should start with two, maybe three clans that have recently formed. Perhaps they're only been officially a clan for a few moons, but the struggles of finding their way to work together could be something of a treat.
Perhaps in the event it survives to when they're essentially formed their codes - which we can change slightly if we wish - we may have another group of cats come together, or hve them come in contact with a clan that has existed in secret for generations.
I have plenty of ideas - I've run a few of these myself - if you would like to message me, or ask me a question here.