This is my first ipad. What do people usually get for protection? I like the apple smart cover. Would it make sense to get a screen protector underneath the smart cover? Or is that redundant?
You shouldn't need a screen protector, and plus, screen protectors decrease the clarity of the screen, even if by just a little.
Go for crystal films, not privacy/anti-glare ones as they'll make your shiny new retina screen look like crap.
It does scratch. Trust me.
I had a friend who got a tiny scratch on his iPhone. He had a nice case for it, never dropped it, took great care of it. But some how, some where, a scratch formed and it bugged him like crazy. It was tiny but when the screen lit up, it was very noticeable and you could feel it every time you ran your finger over it.