Start with the ones you feel you have the best chance of getting cast in. I know- big duh. But you'd be surprised how often people don't follow that advice. For example, if you are not in the union, leave the EPAs for a time when you have less going on...unless you know someone on the casting team who has said you should come because you're perfect for so-and-so. If you are a singer, prioritize the singer call over the dance call and musical theater over the Shakespeare showcase. If you know there is a role that you are perfect for or a director you've worked with before, go to that one first. If you've played the role before (and are still castable for it), go to that one first. If you are a strong mover, look for those words in audition notices. Do your best to get to know as many shows and their characters as possible so that you do not have to rely on casting notice descriptions to decide for you. In the back of your audition notebook, keep a list of shows and character names you are good for. Plan out your week by ranking the importance of your intended auditions and writing the numbers in your datebook to remind you.

Use common sense. If they are looking for 6 feet tall blondes and you are 5'4" with light brown hair, don't waste your time or theirs. Take risks with auditioning but not on that level.