Each hall is a little bit different but the best way is to ask the local BA. A lot of books are currently closed around the west but you can still get in if you know someone. Many halls have an apprenticship program and to become an A list member many halls require 1,000 hours of work or 500 hours of training. Membership information is normally not on the websites but just go down to the hall and ask. Once you are sworn in you can start picking up bounce work fairly regularly. Make sure to take advantage of the training classes and get as many cards as you can. i.e. carp, elec, rail, props, wardrobe, vid ect.