Advice for the First Day of Class: Today We Will. The first day of class is critical. What happens on the first day, even in the first moments, sets the tone for the entire course. The impression you make will last the entire semester, and today’s students are not shy about sharing their opinions. Most students will make up their minds about the course and the instructor during that first class period. That is why you must use the first day, the first moments of class, to inspire confidence in your abilities and create a classroom atmosphere where the rules are clear; expectations are high; and yet students feel welcome, comfortable, and engaged.