Welp, when I have my plot already, I just think, then start planning from the beginning at the first line of of my plot and then ask yourself questions.
How did it all start?
What’s going to happen next?
How should I introduce my characters?
Should I use some text overlays for first scene?
Does my character have roles, if so, break them down.
All characters have personalities, show and don’t tell.
Should I have a short prologue, or just start then use background story.
Do I have to break down my characters, background story, etc.
Will there be a good or bad ending to the story.
Will there be CC, art scenes, etc.
I also use notebooks, when I plan on my laptop and when I get more ideas, i just write them down, then think of the scenery. People plan their stories different, so may get some different answers.