>>5695982start with the classic that always gets recommended by everyone, but thats for a reason, "Story: Style, Structure, Substance, and the Principles of Screenwriting" by Robert Mckee.
If you only read one book, make it that one. Don't let the fact its a screenwriting book fool you, all the techniques he teaches apply to comics and manga.
Then you can branch out onto other books by other people.
