Writing is a skill. And it can be learned and improved by investing a serious amount of time and dedication. Writing a screenplay is a long and challenging process. It requires a degree of technical know-how. There are few steps you can follow when developing your screenplay.
write your logline
Build a treatment – Your first sketch
Structure an Outline
Develop your characters
Write your first draft
Format your screenplay
Take a break, Relax
Come back with fresh perspective, read your screenplay, edit and rewrite.
Always remember though, there are no real rules. So they can happen in any order. It’s up to the story, and especially You.