With increasing one-to-one use of iPads, I found it useful to make up an iPad contract with students. I used this contract in my classroom to give students a visual about proper iPad conduct and care. We discussed responsibilities as a class and then drew symbols to help us remember them. You can also have students write a small title below each box.
Some of the rules we came up with were simple, such as don't eat while using your iPad, make sure you come to class with your iPad charged each day, etc.