I am getting my son a iPad mini 4 for his birthday. Here are the questions I have: 1) I want him to be able to use iMessage, how can this be done? 2) I want him to be able to download free apps, but not be able to purchase them or buy in app stuff 3) Can he listen to my Apple Music account? Can I restrict the Music with has obscene/sex/violent lyrics? Thanks for helping me out.