iPads should be used in a common area (kitchen, family room, etc.) when at home. Avoid having your child bring the iPad to their bedroom.
Actively monitor what is on the iPad. Get the 4-digit pass code and frequently look at the apps on the iPad. If you are unsure of what an app does, Google it!
Charge iPads every night in the same location. Preferably in a common areas such as the kitchen.
Establish home rules and consistently enforce them.
Have frequent conversations about what is on the iPad and have your child show you how they use particular apps.
Determine if you will allow personal content (i.e. photos, music, videos) on the iPad. Then frequently monitor.
Set parental controls on the iPad. Be careful because some parental controls will not allow access to the Internet or other functions students may need in school. To learn more about setting parental controls, visit http://support.apple.com/kb/ht4213.
Below are some articles from Common Sense Media that may help parents navigate screen use issues with their children. References to iPhone settings generally work the same for iPads settings. (Be careful, however, because some parental controls will not allow access to the Internet or other functions students may need in school.)