Once you start numbering scenes for production, you have to find ways to add new scenes between existing ones.
QandA
Dead copyright holders, and being too young
How to track down rights after someone passes on.
Getting a reader job
Where to find the jobs. Warning: you may have to start at slave wages.
Do screenwriters make anything from video rentals?
The writer doesn’t get residuals on rentals, except for whatever Blockbuster paid for each videotape or DVD it bought it from the studio.