Hi Amina,
First impressions are important (We have only one chance to make a good first impression!). But even if day-1 is chaotic (which can be the case, outside the control of the teacher), subsequent classes that greet the student with evrything in oder, teacher ready, resources collected and prepared, ojjectives on the board, etc., - that creates the message "I'm ready". As you imply, it sets the tone for the class.
Barry Westling
