If you had any software like Audacity that you can edit all the audios and for the voice lines for the actors and add sound effects and maybe add any soundtracks or kinds of music on any random Youtubers that are not for copyright much like of Kevin Macleod or Myuuji or Arn Andersson or anything else. And once the scriptwriter is done making a project for the lines for the actors and done making the script and shows you, you had to look all the steps for the script and for the voice lines for the characters so you can add it to edit it and add sound effects too.