It takes an ensemble to make a show; everyone's part is important.

Be respectful of others at all times.

Arrive at rehearsal on time and ready to begin.

Bring your script and a pencil to every rehearsal.

Be specific!  Make clear choices about your character's background and motivation for each line and action.

Don't upstage yourself.  Cheat out so the audience can always see your face and hear your voice.

To help memorize your lines, write them don or speak them aloud to yourself in a mirror.

Remember to thank you director and fellow cast and crew. 

Before each performance wish everyone "break and leg" - which is theater talk for "good luck"!

Be quiet backstage.  If you can see the audience, they can see you, so stay out of sight.

If you forget a line or something unexpected happens on stage, keep going! When you remain confident and in character, it's unlikely that the audience will notice anything is wrong.

Have fun!