A classic suggestion is to get some small business and stress it to the most. As you said, the business being used as example can’t be something too big that’d take months to read or too complex that’d take months to explain and/or understand. The teacher can’t risk the quality of the teaching on the student not understanding the business. The business is secondary, it can’t be the focus of the lesson, teacher’s objective isn’t teach the business.

But that creates a problem I see a lot in unexperienced people. During didatic work, we do things aiming to learn them. We document everything, describe everything, use all UML diagrams and models. And when these ppl go to real work they wanna do the same, wanna use everything, wanna bloat the documentation and waste a lot of time with basics!

I see you’re starting now as a teacher, you have little experience and lack materials. In general, try to be didatic, focus on what you wanna teach and don’t let tools used to help on that to shadow it.