You can start by reading books and writing in your off-time to familiarize yourself with what good writing actually is. Develop a voice for yourself and a writing style you're comfortable with, and don't be verbose, write concisely as you can. Also remember that not every person who publishes a book has to be Shakespeare or Borges, especially when you're writing non-fiction.
If you're able to write properly then that's just about enough you need to write a decent non-fiction book, especially if it's self-publishing. Though I recommend you start studying books in how they're structured and voiced, so you can replicate this in your own works.
As for articles or information, there is none, every writer will tell you the same, read more books and do more writing. It's a skill and must be practiced, so write, and you have to know what you're trying to practice for, so read. It's like if you want to become a professional snowboarder, you watch them on Youtube, and then when you go to the slopes you have an idea of what techniques you need to learn and what level you need to be at to compete.