Imaginations, deep meaning of your thoughts, movie script for me isn't just an idea, it's include imagination. I use to write a script before when I was in my grade, but that was just for my class project and we will have to have to paly with it. It easy to write a script once you have an idea how you wanted it works, how to the scene be going,and what is the concept of the script. The hardest part is, if you put life to the script rather than it was just word by word. Deep meaning with the dialogue you going to write should have meaning and connected to it's plot or scene. Remember not to over due or lack it because it will become dull. Also, create or write a script when your mind is ready to explore everything, and find some place or event that will enhance your script writingskills.