okay,
let's say I have a theory that will revolutionize an academic field, and I plan to write a book about it,

let's say that this theory includes diagrams

how do I go about getting copyrights to it? I've looked at my countries copyright application process but it's pretty ambiguous when it says "literary works" can be copywritten, but not "ideas"

where do diagrams fit into it? It's not really an artistic expression either

Is my best bet just to write a paper about it and submit it with relevant diagrams?