It's important to figure out where your game is set and focus on preparation for a game in that locale. Prepping players for a game set "in Creation" is like prepping players for a modern-day game set "on Earth"; the scope is too large to provide useful information.
In general, I'd advise against too much emphasis on the setting's ancient history. If you sell players on the setting by talking up the Divine Revolution and the First Age, they'll feel that the whole point of play is to bring back the wonders of the First Age. If you sell players on the setting by talking up the Usurpation, they'll feel that the whole point of play is to get revenge on the Dragon-Blooded because the long-dead ancestors of the Dragon-Blooded killed their former incarnations over a thousand years ago. These are useful setting elements, but it's my opinion that prioritizing them over the conflicts of the Time of Tumult sells the current-day setting short.