Tim, Your situation mirrors mine. For many years before I retired, I had similar frustrations, and notes and jottings in multiple notebooks. I really didn't publish anything until my oldest went away to college, and the published article had nothing to do with any of the myriad of ideas in those notebooks.
I remember the well-known writer, Toni Morrison, who talked about her early writing days. Her busy schedule afforded her little time to write. As I recall, her best time for writing was early morning before the rest of the family awoke, but she also stopped to write whenever the muse came; sometimes while doing household chores. So you're not alone.
If you could somehow manage to set aside one hour a day to focus on one writing project, that might help; even if it means getting up an hour earlier, or going to bed an hour later. Someone else suggested a lunch hour. That's fine if you have a laptop.
In my opinion, the most important part in tackling a writing project is to decide the genre and the form. Is it a fiction on non-fiction book, a poem, an article, or a short story? I suggest you start with an article, or the weekly Challenge. You already have a "big book full of ideas." Choose a topic from your ideas, collect additional notes, jottings, comments from your ideas' book that relate to that topic.
Now that you're focused on something concrete and specific, spend your working ideas thinking about material for the article, the story, etc. Whatever ideas the muse sends your way will no longer be part of a collection of ideas, but material for a specific project.
Making time to write often means taking time to write; wresting one hour from the 24 hours in our day.