You will find that when the new interns show up, you will realize how much more you know and what important things you have learned and can teach them. Seriously. You know the way your hospital works, computer system, common nursing calls, how to manage basic things, etc. When the new interns show up, they need someone to tell them where to start (with just about everything, including "where's the bathroom/callroom/cafeteria") and give them hints about how to best keep organized and get things done. You know basic patient management, and you can also pass along this knowledge as appropriate.
It's not so much "planning" what to tell them...for the first rotation of the year, it's helping them learn how to navigate your hospital, and how to go about doing intern things, like putting in orders, discharging, SW stuff, keeping track of things, etc.