My current challenge is being a new manager in a currently "broken" department. Although the team knows a change is expected, all of my suggestions are met with negativity. Any suggestions?

Here is a questions that I didn't necessarily find the answer to. I love the idea of only 20% lecture, however, there is so much content that has to be delivered. How do I ensure that the students are getting the information they need, if I'm only lecturing 20% of the time?