I haven't really finished a comic of mine considering I'm new to writing, so I'm not really a good source of the best way to do it. That said, I'm gonna share how I come up with the general outline of my projects.
To start it off, I come up with a basic summary of the comic and if I can easily add more to to it, then I start writing plot points or specific scenes I'd want the story to go towards. Sometimes, I'll try to incorporate vague character arcs into writing such plot points or I'll try to do some world-building beforehand..Once there's a sufficient amount of "plot", I'll put together a rough idea of how many chapters I want and come up a vague idea of what happens in these chapters. Having a clear idea of an end goal helps, you'll find out what's important enough to include once you start writing
Now, instead of actually writing the chapters at this point, I start creating characters and their descriptions, motivations, etc..This influences how I start writing the chapters with character dynamics and all that. I don't write the entire cast though, just enough for the next few chapters. After that, then I move on to writing to detail the vague ideas I had in mind for the chapters, a basic "here's what I want done by the end of it" will help you a bunch. The last thing I do is determine how many pages I want in each chapter. I usually repeat the process of possible new characters, new dynamics, and detailing vague ideas as the chapters go on. World-building and creating locations are kind of a second priority once the writing starts.
Again, not experienced enough to say whether this works or not,because I haven't finished a project yet, but it works for me! I feel like my progress is well paced enough. My chapters usually take a couple days to write, I usually do "storyboarding" (more like describing panels) with the script.
