At creation, Moodle courses are in the 'Hide' mode which makes them invisible to students. When you want students to see your course in Moodle, you must change the setting to 'Show'.
(If when you click into your Moodle course, and the title of the course appears grey - it is in the 'Hide' mode. You must change to 'Show' for students to see it.)
Navigate to Course Administration (menu on lower left of course page), click Edit Settings.
Next to 'Visible', click the drop down to choose 'Show'. Save changes at the bottom of the screen.