Well it's a fair question.
For cRPG, i think it's pretty simple to get started:
Decide on a name, pick a banner that's not in use yet, make a thread on the factions forum and you're done.
However, when the clan gets bigger, you might need to get a few more people to help out. Things you could do as the clan gets bigger:
Essential:
- Get one or two guys to be 'second in command' for when the clan leader is away.
- Get a forum or use a skype group, a steam group or even a google+ hangout to communicate better
- Get a teamspeak server or get a spot on on one of the existing teamspeak servers
Optional:
- Make a recruitment plan (set up criteria) and appoint recruitment officer(s)
- Set up a regular training day
- Make cool videos promoting your clan
- Record battles and stream live events
- Make a really cool clan website
- Make a skin pack (replace intro movie, crosshair, sounds, banner pack, etc)
Strategus specific:
- Appoint a commander (or council) for overall strategus strategy
- Set several trusted members to level 10 so they can manage the fiefs
- Appoint fiefs to very active players
- Recruit more no-life crazies that keep an eye on strategus 24/7
- Do lots and lots of politics, talking to other clans, cutting deals and making secret alliances
That's what popped into my mind when writing this. By no means a complete list, but perhaps a start. Please add more helpful suggestions and feel free to criticize.