Tomorrow I am going on a 10 hour plane ride. I was wondering if it was okay to use my iPad, iPod and Nintendo on the plane.
If it is then do I need to turn the plane mode on?

You can use them with airplane mode when you are told it is OK. Take offs and landings are no-no's.

Most airlines will have you keep them off till after take off and for landing, but besides that, you should be free to use them. Also most will have electric outlets where they can be plugged in.

All of my long plane trips, they also had movies to watch.