There's all sorts of jobs... within all the different art forms! In a theatre for example, there's marketing, education, development, box office, front of house and venue management, backstage things. Obviously for some positions you need formal training, others you don't. However, if you don't have any experience (most people have some i.e. running any kind of arts event, like a folk club or festival is good experience)the expect to start at the bottom. Once you've been there for a few years it can be very quick to progress up the ladder.