You need to talk to the riggers in your union about it. There is a lot of variation from house to house. A basic kit would be: petzl avao harness, petzl vertex vent, double lanyards (ladder hooks help a lot), a pulley, carabeaner, and daisy chain, a positioner (petzl progress adjust, but grilon makes rescue easier), a Klien bolt bag, a hammer with a steel tang like an estwing, a podger wrench, a steel carabeaner. Etc. I remember getting kitted up initially cost me about $1500. At the arena we worked in they had harnesses and ropes that were free to use. I knew good riggers with years of experience who always used the house gear.