If you are new to Moodle it may look complex, because there are a lot of things it can do and it's very configurable!
But don't worry, the basics are simple. Here are some tips to get you started:
Courses are made of sections (they can be weeks, or they can be topics, like this course).
You fill the sections with resources (things for students to read or look at) and activities (things for them to do).
There are a lot of tools to make your course and site look how you want.
This page from the official Moodle Docs is a good guide to get you started with configuring your Moodle site.
This free MOOC (Massive Open Online Course) runs for 4 weeks every January and August and can be a nice way to start learning Moodle with others.