Binder with the keys

I would just get an old-fashioned binder and start with the QuickBooks lists because they're already in place, print them out, put them in, and then get dividers and say vendors, customers, and employees. And then as you think of things, you could just tear a piece of paper because these starts come in one ear and go out the other very quickly. Make notes and shove the note into the book. So at least you're that far. It might not be a formal document.
But you know, the next time you look at the book, with time to spare, that's like, that's right. That's why I wrote that. So that's one way to get going.