They should have downloaded automatically open Music and tap on My Music in the bottom left of your screen. Do you see them there?
Go to Settings scroll down to Music tap on that and turn off Show Apple Music.
Sorry what do you mean by "nothing"?
Tap all around at the top or the bottom to get out of that mode
"Email"? I really am not sure what you are talking about at this point. I thought you were referring to the Music icon on your iPad with the colored notes on it? If you tap on that there should be 4 icons at the bottom My Music, Playlists, Radio, and Connect tap on My Music.....
Not the iTunes Store app the "MUSIC app".....
Can you take a picture of what you are talking about? I'm sure it is a VERY SIMPLE solution. You have to be signed in to your Apple account to see your purchases in Music maybe that is what you are seeing?
If you are looking at "email" you are in the wrong place find the Music app on the iPad
Is that turned on?