Is there a reasonable amount of seating or is it standing room only?

There is some seating up by the bar, but the majority of the venue is stamding room only.

Standing room only unless you use the bar

Depends on the show. The venue has seating available.

If you wish to sit, only way it will happen is to get there hours before show sit and have dinner or drinks in the bar in front. That will get you priority entry, that way a seat. Otherwise you will be standing