What happens next in this paragraph?

How to put on a play
Choose a script.
The script is the document that contains all the lines and stage directions of a play. It defines act and scene changes, descriptions of the characters and ideas for staging.
You can write your own play, or you can use a script from an established playwright. If you are putting on a musical, you will also need to buy or compose a score (the music that goes with the play).