Planning ahead is a big thing. Always being prepared with the proper coursework for that lecture and class and the proper amount of copies and materials for the students, they like to see that the instructor is prepared or it sets a bad example and makes them not trust the abilities of the instructor. Being consistent also builds trust in an instructors abilities. Students look up to their instructors as role models and they tend to put the instructor on a pedestal. Being consistent with the same rules for all classes lets them know that your not bending rules for certain students or playing favorites, rules are rules for everyone equally.