There are 7 basic steps to putting on a show:
1. Auditions
2. First Reads
3. Blocking
4. Rehearsals
5. Technical Rehearsals
6. Opening
7. The Run
I use the term auditions to refer to the process of working to get a role in the play.
Here is a list of my posts on auditioning:
The Audition Process: Part One is here, Part Two is here, and Part Three is here
Some Further Comments on the Audition Process: Part One is here and Part Two is here
For an audition, you'll also need a headshot and a resume. My post on headshots is here and my post on resumes is here.