Ebb and Flow
Experts are, well, experts. Locksmiths, rogues, sages, teachers, merchants, diplomats are all considered experts at what they do.
Because of the nature of the Expert class, you can basically choose to be whatever it is you want to put your mind to. As such, starting equipment for an Expert will be tailored to their chosen skills, focus, and backstory and must be determined with the DM.