When I hear these words, the first thing that comes to my mind is communication with students. I believe that first day of class time should be spend in getting to know your students. This could be easily done by conversation or handing out student survey form that I found on this link: http://www.humber.ca/centreforteachingandlearning/instructional-strategies/teaching-methods/course-development-tools/creating-a-positive-learning-environment.html.
But after reading this article, I realized that it is much more than good communication ( http://www.teachthought.com/learning/10-characteristics-of-a-highly-effective-learning-environment/). It includes your engaging learning strategies, assessments, positive feedback and much more. So, it all depends on your classroom management skills. The most challenging part of this is dealing with disruptive behavior especially in adults. I learned about the idea of hanging a poster listing expected class behaviors. Its much effective if the list is prepared after class discussion and including students suggestions. It was really helpful that the below mentioned article provided detailed tactics to use in mild and persistent disruptions.