ocyne12 said: "Those of you who know the book, can you tell me if these vocal ranges are good for the characters/fit the characters attributes?"
This seems like the least valuable entry point into creating a musical. You have no book. No songs. No style of music picked. No rights. But you know the vocal range of each character?! What is step two, what sort of shoes each wears?
I think the best creative act one can choose is silence. Put your head down, stop seeking external feedback, and work. External approval is better after the work is done, or at least in a shape where you NEED that feedback to continue.