Exhibition Documentation Tips

Hi all! I work professionally doing event work, portraits, art documentation, but want to add exhibition documentation to my available services. I've done some before but as favors for friends in small spaces and never in any sort of professional capacity I felt comfortable charging professional rates for so:

— What is the most important priority? Color accuracy? Coverage?

— What is a solid workflow? Atmospheric shots? Straight-on documentation? For every piece? What about signage? Detail shots?

— Any equipment you feel is absolutely essential? No added light but maybe odd focal lengths you actually find useful? Color cards for balancing? Polarizers for glare?

I've also been asking around and searching on Google but I thought I'd pose the question here to catch any little quirks.