In my experience, having a 1 page cheat sheet for each session has benefits that far outweigh the time that it takes to build it. I recommend creating a unique sheet for each session, a new cheat sheet for that specific game.
Plot Hooks – You should create hooks for every session, not just the first adventure. You want to get ‘buy in’ for each game so that your players and their characters really care about what is going on in.
Locations/Encounters/Scenes – Depending on the structure of the game system you’re using, having a bullet point list of the locations such as dungeon rooms, waypoints on the road or unique places can be a loose guide to keep your game on track. If you’re running a more crunchy dungeon delve style of adventure, having a list of probable encounters is just as valuable. As a storyteller, I find that having a list of possible scenes provides me with a loose framework for the story. Bonus Points: Create a scene tailored to put each player in the spotlight.