Scenarios for First Time Managers

I'd second what Christy mentioned about finding out more about what the desired behaviors look like and where new managers at your organization struggle most with demonstrating those behaviors. The more you can make this about the specific challenges people have at your organization with moving from being an individual contributor to their first manager role, the more valuable the training will be.

Another thing to think about is where in each module a scenario could be most useful. Often scenarios are used at the end of a lesson/course so people can practice using the information they just learned. And they're fantastic for that. But you can also include scenarios (in particular, mini scenarios) midway through a module to help people practice what they're learning along the way, especially when a module covers several skills or concepts. Scenarios can also be useful at the beginning of a module to set the stage for the content or help learners see where they might currently make missteps and buy in to the idea of learning more.

All that said, it's always important to make sure whatever learning technique or activity you plan on using is the right fit for the audience and the content. As much as scenarios are fantastic learning experiences, they aren't the best fit for every situation, in large part because they usually aren't fast to go through compared to other techniques. In each instance you're thinking about using a scenario just be sure to consider if it's the most effective option for your circumstance or if you can make the same impact (or more) with another kind of learning activity or experience.