Japanese concert etiquette – Oasis

Hello, Fellow Residents!

I have managed to acquire tickets to see Oasis at Tokyo Dome in a couple of weeks' time. I have never attended a large scale event in Japan and am looking for advice so that I can be respectful whilst enjoying myself. If you can help with the following questions, I would appreciate it:

  1. The stadium is all-seater with designated seats. If I stand up and dance, will I be the only one?

  2. Can I take a small poster or sign to hold up (not rude/no swearing), or will this get me kicked out by the door staff?

  3. Will I need to remortgage my house to buy a beer inside the stadium? Is beer even available?

  4. What's the sound quality generally like in there, considering it's really a baseball field?

  5. Any tips or things to do/avoid?

Thank you

by SteveSteveSteve-O