What can be most helpful at this point is ensuring that these things are not only documented (beyond your own mind), but that they are also organized. Accomplishing this can help you immensely toward the actual scriptwriting.
In my notebook of play ideas, I continually add information as it comes to me. Then, when I begin my next script, I have all these notes, etc., ready to work with.
I have frequently stated that writer's block is not really an affliction as much as it is a condition of not being properly prepared to write.
The romantic image of the scriptwriter sitting at a typewriter with a blank piece of paper and typing "Act I, Scene 1" while waiting for the Muse to inspire is not reality. Rather, scriptwriting, as with all writing, is best served by good, old-fashioned planning and information gathering.
A simile I like to use in describing this planning and organizing is a jigsaw puzzle.
Many people start working a jigsaw puzzle by finding all the edge pieces and building the border, thus setting the overall dimensions and orientation. This I liken to creating the script's outline and determining its dimensions (e.g., genre, length, and number of scenes and characters).
Next, people may put together small combinations of pieces, such as faces or significant objects, and then place those combinations in approximate positions relative to the border. In my notes, I may have dozens of such combinations, which may be character descriptions, snippets of dialogue, storylines, scenic information, comedic bits, and emotional targets.
Thus, by organizing all this data, a more comprehensive picture of my script emerges. Sometimes it's just enough to get me started writing the script with enthusiasm and drive.
Other times, after looking at this picture, I may realize that there are huge holes or big problems with the script. And recognizing these negative attributes early makes them much easier to fix or rework than if I didn't address them until after a draft or two had been completed.
