The notified existence of ancient artifacts as something that gives statistical boons, the fact there is a unit list, and that posts need to be written as orders in which their effect will be determined by someone else, sections placing emphasis on how one's allowed to spend, build, or whatever. If you're interested in world building then just give us a world and let the players paint it, if there are things you feel MUST be included, then do so in the story introduction or even reserve the first IC post for yourself to mention or lay down the basic things you want included in lore building. But it's not going to come from a rigid attempt at raining in things by structuring it as Civilization, it raises arbitrary numerical restrictions.