You only really use the LMS to get onto the page for each subject.
They'll get released once they actually upload their stuff to the LMS.
There's nothing that really needs to be taught - everything that they post will go up in the announcements for each subject, and the rest is up to you to explore, because each subject sets up their LMS page differently. Smaller languages, for instance, have virtually nothing on them and there are no LMS updates, whereas larger subjects with pracs (i.e. 1st year bio, chem) have updates multiple times per week to notify students of assignments and things deemed relevant to the study of the course.
As far as I know, to answer your questions, no there are not any online tutorials which teach you how to use the LMS and there aren't workshops which cover the use of the LMS. There's simply no need for it.