I have similar situation. Friend has asked me to setup new KFHD for her daughter. I have used my Amazon account for now, then will de-register it.
What are the MUST HAVE basic apps for a young person (13 yrs, non-techie). I've started with a couple of games, ES Fie Explorer. Now am thinking about MX Player for videos, Mandano reader for non-mobi files and WiFi file explorer for easy file xfer.
I'll set up a new Amazon account for her with her parents when I return the kindle. Superb screen!
Any other recommendations?