I'm just starting a non-fiction series about Arabian horses, probably 10-12 books total. It' sounds like a large
project but I've been a professional writer for nearly 20 years now, so my writing process is pretty well-set. If I get one book in the series done a year, that'll be fine, but I'll also be working on novels at the same time. Trying to do this much when I started out would have been impossible but now I know what I'm doing so it's all good!
When I started professionally writing I was a newspaper reporter. I was constantly on the go, getting the stories my editor wanted ("blood and guts" because that's what people want to read), occasionally getting the editor to accept lifestyle/human interest articles. When I got offered a contract by a university-related organization as a researcher/analyst/technical writer, I leaped at the chance because aside from a few meetings a month I could work from home. I did that for twelve years or so until I weaned myself from that work to focus on writing for myself.
The discipline of writing for myself is no different than it was before. What I do is like working a 9-5 job: if I'm asked to do something that cuts into my work schedule, unless it's super important I say I can't because I have to work -- and then I DO work.
If you're going to take on the projects you're talking about, then you've got to carve out regular hours and stick to them. If you've got kids, you've got to have a place to work and your kids have to learn to leave you alone while you work. If you have an office with a door, then close the door and get to work! (A monitor so you can keep an eye on the kids might help you close that door!)
What I do during my work hours: I begin by spending a lot of time researching. I want to be absolutely clear I understand what the end product
should look like by studying products similar to what I have in mind. I'm talking about content as well as format -- both are important. If your projects include publishing, then you need to also decide on a publishing method (self, hybrid, or traditional) and then research what you'll have to do to accomplish publishing using that method.
Then I start reading other people's work on the same topic. I want to be sure that I'm not reinventing the wheel. I want to be sure I'm bringing something new to the world about that subject. I take notes -- LOTS of notes. I keep lists of references so at the end if I need to give credit I don't forget anyone.
Oh, about the notes: You need a method of organizing them or they'll be worthless. Paper or digital, doesn't matter, you have to file everything in a meaningful way or don't bother taking notes at all.
I'm not sure what your history curriculum will entail, so I'll address the book (even though I don't know what distributism means or why children should read about it).
Somewhere along the line you'll have the irresistible urge to actually start writing your book. That's when all the research you've done makes your life easier. By this time you should have developed a strong idea of what information your book needs to include -- not just in general but specifically. This is the point where you need to organize all those ideas & notes into what amounts to a working outline (this doesn't have to be a formal outline!) Note that some people find writing outlines to be impossible. If you're one of them, you'll find that if you wait to outline until *after* you've done everything I've said, and then you simply organize it, the outline will flow from that painlessly.
So take your notes and put them in a logical order based on the research you've done. Fiction or non-fiction, there is still a beginning (where you present your project), a middle (where you describe everything that needs to be explained about your project -- and having researched how others do this comes in real handy here), and a conclusion (where you summarize the project and add any concluding remarks you feel are necessary).
Then flesh out those notes. Write a first draft of your book. Don't bother worrying about saying what you want to say correctly, just make sure you're saying things. Spew it all out! This is where it's even more important that you've got your work hours set and that you stick to them! It could be an hour a day or eight hours (I don't recommend eight!). Probably two is about right. They don't even have to be two hours in a row but each session definitely needs to be no less than an hour. You won't accomplish anything trying to work in five minutes grabbed here and there.
It could take a long time to write a first draft. Don't sweat it. Just keep writing it. The rule for writing is "butt to chair", meaning you can't just think about it, blog about it, dream about it -- you have to sit down at your desk and actually do it.
More advice: When you're doing things that don't require you to think much about them, such as washing dishes or vacuuming, pulling weeds, whatever, use that time to think about the last thing you wrote and the next thing you will write. I find the time I spend cleaning my horses' pens to be so valuable for thinking about my writing that I include it in my books' and stories' bios! I also use my cell phone to record my thoughts as they come to me, because I can guarantee all that good thinking will disappear if you don't capture them immediately. Quite often those recordings wind up going straight into my current project .
That's probably way more than you wanted to know about sticking to a regular routine, but if you don't have a full plan you have no plan. You need to know the beginning, middle, and end of your project's progress just as much as your book needs to have a beginning, middle, and end.
Oh, and maybe the biggest tip of all: You will feel overwhelmed. Don't sweat that! It's a symptom that has a cure, it's not something to be afraid of. When you are overwhelmed it just means you've taken too big a bite. It means you need to break down whatever stage you're at (research, organization, writing, publishing) into smaller steps. No matter how small the steps are, if you've bogged down take a smaller step. And by the way, when you have to create new, smaller steps, make sure you change your organization/outline to match!
I don't know how much of what I've written here is useful, but honestly there are whole books out there about how to get a book done! One that I've read most recently is
Refuse to Be Done, by Matt Bell. Highly recommended.