Set up your expectations at the beginning of the class and work with students to meet the expections. With regards to assignments, remind stundents constantly so you don't have any surprises at the end.

Keep your delivery sessions shorts and include variety of learning styles to meet the needs of the majority of the students.

As an instructor, get into the habit of making a list, so you can cross check to deliver your content and not deviate from it.

As a teacher, you Lead by example by practicing what you say. You also demonstrate professionalism by showing up on time, do your homework well and prepare your material ready to go. Show interest in the material that you are going to teach to make the students develop interest in the material.