Definitely learn from your mistakes and try not to repeat them.  Also try to get information and suggestions from other instructors

There is much truth to students having outside factors that play into their behavior.  Not that it is an excuse allowing this behavior, but sometimes just listening to them assists how they manage their responses

Like some of the suggestions in managing the inattentive students.  Definitely will have to try one for the students sitting at the back of the class chit chatting and on their phones

Providing clear and concise information about expectations is probably the best take away.  Also need to make sure to communicate in a way that is understandable to students.