i'm not even in the scripting stage yet lol but i totally feel you. i have a bunch of notes and ideas for scenes that i just wanna write already, but i want everything to flow smoothly and have a concrete foundation. it's hard though because a. there's so much to plan and research, especially in a fantasy world with eight realms that takes place in ancient history and b. whenever i'm working on it i think of new ideas that seem better and sometimes change the story completely. it's definitely evolved from what the original idea was that's for sure.
anyways, good luck with your comic dude! i'll definitely check it out when you post it. and if you ever want feedback on something, like an idea or character design, i'd be down to help.