I have a Nokia Lumia 930 and I'd like to put it in demo mode like in the stores. How do I accomplish that?
You actually don't need to wipe it. Go to Settings > About and tap on "Device Information" five times. Then scroll down and you'll see a button that says "Enable demo mode".
You need a special phone / rom for that, a normal phone can't be set up that way. You could perhaps make use of the apps corner or kids corner for demo purposes.