Storytime
The person who plays a a character in a play
Actor or Actress
The person who tells the actors, set designers, costume designers, and other production staff what their creative vision for the performance is.
Director
The person who designs the background and any furniture used in a play.
Set designer
The person who chooses and makes the costumes.
Costume designer
When you are about to perform in a play, and someone wants to wish you luck, they may say this.
Break a Leg