There are a number of threads on this forum about finding jobs, so I'd recommend doing a search.
Are you looking for work in your current geographic area, or are you open to traveling? What kind of work are you looking for- theatre, dance, opera, or something else? Have you considered doing an internship or apprenticeship? They can be a great way to expand your skills and your professional network.
You can network with people you already know- professors, people you've worked with previously, etc. You can do a resume mailing to the theatres in your area. You can look on job websites or listservs to see what jobs are posted.
I'd be happy to post some more specific advice, but knowing the answers to a few of these questions will help.