Lesson 1 - Consume to Create
You need to consume in order to create. Don't be afraid to print designs from sites like Thingiverse because it helps you to understand how your printer works. It will also lead to lessons where the print will not work which will cause you to question why. Questioning is never a bad thing.
Following a recipe isn't a bad thing. The Invent to Learn Guide to 3D Printing in the Classroom is a great resource to start with. You need to be able to understand in order to modify and create sometimes. But make sure that you move beyond consumption and recipes to the real power of creating with the 3D printer.