Screenwriting is the most prized of all the cinematic arts. Actually, it isn't, but it should be.
You have all the scenes. Just go home and word it in.
The challenge of screenwriting is to say much in little and then take half of that little out and still preserve an effect of leisure and natural movement.
Write every day, line by line, page by page, hour by hour. Do this despite fear. For above all else, beyond imagination and skill, what the world asks of you is courage, courage to risk rejection, ridicule and failure. As you follow the quest for stories told with meaning and beauty, study thoughtfully but write boldly. Then, like the hero of the fable, your dance will dazzle the world.
There’s absolutely no reason you can’t write in ANY genre if you are prepared to put the work in. Genre is craft. Craft can be learnt. So learn the conventions of the genre you want to write. Watch all the movies in that genre, big and small; read all the scripts. Go to events, learn about it. Read articles, blogs, soak it all up.
I don’t believe in writer’s block. I don’t know what that is. There are just certain little areas that I know I’m going to get through. It’s just a matter of finding a way.