As far as GA FLOOR tickets goes. To get into the "pit area" is that based on a first come first serve? Are wristbands handed out? Or is the whole floor/pit area open range? Is it worth me showing up early to get into that area? Or doesn't matter?

The GA floor "pit area" is first come first served. I've been there for a few popular concerts and always arrive for the opening act. I always get a prime spot, as it's never been packed for the opener. It gets more filled for the main act so I'd say it's fine to time arrival for towards the end of the first act and then to move in and get your pit spot.

Are wristbands handed out? Or people can come and go as they please? Thank you for the response!