It should be a basic play guide that scales with the experience of the player. "Heres how to be a Knight," "heres how to be a Lord," "a marshal," etc
Well, this is what we have now, but severely outdated:
Would you use a similar layout/approach and just enhance it with up to date screenshots and information, or go for an entirely different approach?
I think it's best to hear from inexperienced players in your realms to hear what would really be helpful.