Assemble a team of employees or volunteers interested in working on set design. Set design requires a diverse skill set -- everything from painting to woodwork and connecting lights -- so cast a wide net and take on anyone sincerely interested in set design and willing to put in work for the project.
Prepare a basic conceptual design of what you want the stage to look like. This early design can be as simple as a few sketches, but must clarify basic elements like stage size and shape, top-level design features, stage entrances and exits and main lighting and sound effects.
Assign positions to each member of the project based on personal interests, skills and the nature of the work to be done. Designate at least one stage manager to play a leadership role over the process and assign lower-level directors, such as someone to supervise costumes, set design, lighting or sound. Each section or lower-level director should have enough manpower to complete the necessary tasks in the amount of time available.
Prepare the promptbook, a technical version of the script that includes stage indications like entrances, exits, and changes in lighting or sound. Make sure everyone on the team is familiar with the promptbook and that potential conflicts between sections like lighting and sound are worked out during technical rehearsals.
Designate a regular time for the whole team to get together in order to work and conduct technical rehearsals.
Decide on a budget, purchasing plan and renting scheme to acquire all of the equipment and staging elements you will need for the performance. Organize fundraisers or sell advance tickets if necessary and appropriate.
Prepare the physical specifications of the stage, including all carpentry and painting involved in the set design and installing any necessary light, sound and special effect machines. Inspect the stage to identify any potential fire or collapse risks, and always keep your cast's safety in mind.
Conduct a number of full technical rehearsals, combining all staging elements and costumes with acting prompts, before the first performance and until you are completely satisfied with the staging and confident that your cast is ready for a live performance.