I tend to mainly just use google docs. I have one for my outline and one for my script, as I can flip back and fourth between them while writing. I find that google doc's outline feature is great for me to separate chapters and scenes and to quickly find them. It helps a lot with organisation. I like to have all my writing in one place so that I'm able to see how my scenes work together linearly.
I just like having all of my story written out before I start as it reduces the stress of writing week to week and allows for edits (I tend to change a lot from my outline as well)
I do also have a notebook where I jot ideas down if I'm not sure on an idea, or I need to think of a solution to a specific plot point.
As for planning pages, I made myself a template on clip studio where I can thumbnail my pages and see how they work side by side. Doing this also helps me work out how many pages I need to get done in a week. It's messy because I'm the only one who needs to understand it.