Adding my two cents, you should definitely grab a JETech Case for Tablet for basic protection or the MoKo Slim Lightweight Case if you need a foldable stand for viewing.

Not a dumb question at all, weve all been there. Since you are using it for your commute, honestly the biggest risk is just dropping it when someone bumps into you on the bus or train. I was super paranoid about mine when I first got a tablet, but honestly a cheap folio case works wonders. I bought a Spigen Rugged Armor Pro Case for my device and honestly I have zero complaints. It has a little flap that protects the screen when its in my bag and serves as a stand for movies, which is a total game changer for plane or train rides. Regarding the screen protector, dont overspend. If you are worried about scratches from keys or pens in your bag, just grab a standard Spigen Tempered Glass Screen Protector and call it a day. It feels way better than those cheap plastic films and keeps the display clear. You really dont need to go crazy with expensive accessories. Just keep it protected from the daily grind and you will be good to go. Honestly, just those two things saved me so much stress when I started taking my tablet everywhere. Enjoy the movies!

^ This. Also, if you plan on watching lots of movies, grab a UGREEN Tablet Stand Multi-Angle so your neck doesnt kill you while sitting on the train.