Questions...
I've not tried using a different store so I would love to know more about this myself.
Get a Pro Controller, it's 100% worth it.
In terms of an SD card, I haven't bothered with one yet as I'm only playing physical copies of Zelda and MK8.
It's probably worth checking out the average size of the games you're interested in first and then decide from there.
For a screen protector I highly recommend the Orzly, it's great quality and probably the easiest screen protector I've ever applied.
(after 100% on 14 