First, ask what needs to be text and what doesn't. It's too easy to depend heavily on written text when something else would do much better. For example, a frame of programmed instruction (for which you'd use a "lesson activity" in Moodle) might be better as a series of short YouTube videos.
When drafting text information for Moodle, the most important thing to remember is this:
Write everything in your word processor first and check it. Everything. Even the texts of all your activities. And make sure you get the order right at this stage. Don't go into Moodle until it's all correct in Word.
Why? Because it's really, really easy to copy and paste from Word into Moodle and fairly quick. But it's really, really slow and clunky to create and edit text items in Moodle.
And why would I say this? It looks like you could write and edit in Moodle. And you want to try because you could see how it will look later on in something that is instantly interactive. But you can't. You just get frustrated.