Either or. Whichever is convenient for you. Just know, in person it may be a longer queue
You can show up, but depending on the night you may see long lines. If it's a weeknight (M-Th)you should be fine. Weekend evenings and holidays are the most congested.
At times there can be a long wait in line so use the kiosk, better to get there early to get a good seat.
Ditto what Xandra said
Either one! You can buy tickets at the door or online.
Thanks! Your answer is awaiting moderation.