Hey there’s this advice from an old thread that would be handy - How do you make an Empire group?
The other thing I’d try to make sure of is that you create your characters as a group, rather than a series of individuals. Think about how they’ll work together. Like if you’re all going on the battlefield having a healer and someone to make you potions (possibly the same person) is handy. And likewise possibly having a battlemage as well with a staff to back up any fighters.
Or if you want to go heavy into politics take a look at how that works in your nation and what resource means you get votes, like businesses in the League or Congregations in Highguard. Then it can be worth all clubbing together and getting the same resource so you have a bloc vote. It’s also worth working out where there are gaps so you’re not in a territory with loads of groups already there.