Comparisons and advocacy

Moodle is overkill for what you want to do. However, it will do the job, and if you want to do more later, then Moodle gives you scope to expand. For example, with Moodle you could easily add a discussion forum so the students can ask each other for help with things they don't understand. Or one day you might decide to make a simple quiz to help people memorise some key facts, with Moodle, those possibilities are there.

All the documentation is on http://docs.moodle.org/. For example, http://docs.moodle.org/en/Getting_started_for_teachers might be a good place to start.