What you do on the first day of classes sets the tone for the rest of the semester.
If you hand out the syllabus and hold up the book and then let them go early, what does that say about the importance of class time?
If you read the syllabus to them, do they “hear” that it isn’t important to read for themselves?
If you ask them to do an activity related to the content you are teaching, does it set the stage for future class participation?
Here are some links to other ideas for the first day of class:
And there are a lot more resources out there.