Are you offering a complete online course? Are you creating a hybrid course that's both online and offline? Or do you have a regular class and want to use Moodle to supplement and extend it? If your course includes face-to-face time, your Moodle course organization doesn't not need to make use of the communication tools as much as if you're running a course where you will never see your students. Structure and organize your course around the teaching model you're adapting.
I discuss eLearning models such as blended or hybrid learning in Chapter 2.