One stumbling block for beginning writers is formatting. Yes, you can write in Word, Google Docs, even a yellow legal pad, but if you want it to LOOK like a screenplay, you’ll need some software to help with that.
While many professionals use Final Draft (the most expensive), the popularity of that program has been waning. There are many cheaper alternatives that make PDF files just as well.
If you’re on Windows, I recommend the free app TRELBY. For Mac users, there are many low cost programs such as HIGHLAND, SLUGLINE, and CELTX. Web apps can be appealing, but paying their subscription rates probably isn’t worth it if you’re not a professional writer.
See our page of software links on the RWW website at: