The timeline for working with an existing script is very different to creating a playbuilt performance. The following process will help you stay on track when creating your own production.
Choose a script - think about the style, content, length and number of actors required.
Create a directorial concept or director's vision.
Establish your design ideas - set, costume, lighting, sound, props, marketing. The designers should finish their designs before rehearsal starts. They will continue to create anything needed for the production throughout the process, making sure that everything is ready for the technical run. Some elements of props or costumes may be needed for the rehearsal period.
Create a production calendar - a plan including deadlines for designs, a breakdown of scene rehearsals and a date for your technical rehearsals, run-through and dress rehearsal.
Start rehearsals - Stage and block all scenes according to your production calendar. Make sure actors are familiar with the scenes prior to starting rehearsals and have pencils on stage to record blocking.
Learn lines!
Rehearse individual scenes focusing on details - create stage business and focus on elements of drama (tension, rhythm and pace, movement, characterisation)
A technical run - this is where you run-through the performance with lighting, sound and props. Any issues should be worked out at this point.
Have a run-through - a full run of your performance without stopping. A director should take notes and give them to the actors at the end of the performance.
Have a full dress rehearsal - with all costume, set, props, lighting and sound. This should be exactly what you present to your audience.