Praise, praise and more praise
Though break up the syrup with the odd "yes", "Uh huh" and head nod.
See here for praise words in te reo.
Students learn best when they understand WHY they are learning something
Start your lesson with your learning objective and learning outcome. You could write them on the board, tell the students, include them in your PowerPoint, or have them included in your handout.
What's the difference between a learning objective and a learning outcome?
Think of an objective as "to learn", and an outcome as "to know" or "to understand".
A learning objective is a statement that defines the goal of the lesson - "To learn how to do basic APA referencing."
A learning outcome is a statement that explains what the learner will be able to do as result of the lesson - "By the end of his lesson, you will know how to do an in-text citation and full references for books, ebooks and websites. And you'll know where to find help via the LibGuides."
Maintain eye contact
When talking and listening to students.
Having your head down in your computer indicates you are not really engaged in the conversation.
If talking while writing on the white board, turn every so often to look at the students while you talk, or at the student talking.