A stage manager’s job is mainly one of organization; as the stage manager you will keep many aspects of the show running smoothly. During the rehearsal process, you will keep track of cast conflicts, take blocking notes at rehearsals, and help keep rehearsals running on schedule. You will also be the point of contact between directors, staff, and cast. During tech rehearsals, you will play a large role in helping integrate the technical aspects of the show into the performance. You will call the show during performances, as well as making sure the stage is set and the actors are in places. You keep track of everything that happens at rehearsals and generally act as an assistant to the director.
Depending on the division of other staff roles and responsibilities, you may be asked to construct a rehearsal schedule and find rehearsal spaces. You will also likely take on a number of other roles in the staff, depending on the size of the production. You may have to act as props master, or as a light or sound operator. On a larger show, you may have or more assistant stage manager, as well as a run crew or a number of board operators. In large productions, the stage manager is responsible for organizing these people.
Stage managing is an extremely rewarding way to get involved in theater, especially if you are new to tech. It requires a huge time commitment, but it requires very little experience and you can really learn on the job. By SMing a show, you get to see what everyone else does; you are a friend of both the cast and the staff. It's hard work, and it can be thankless at times, but you also have the fortune of being involved in every aspect of the production, from auditions through rehearsals and to the performances.