As you have certainly come to the conclusion while reading the theoretical background of the previous practical class, non-verbal communication is a very broad area which is impossible to explore in a few teaching classes. To get ready for individual research of that complex area, make preparation for the practical class individually.
Preparation for the practical class
Choose one field of non-verbal communication that you are particularly interested in, for instance, non-verbal communication between genders, non-verbal communication in business communication, non-verbal communication at school or college, non-verbal communication between different cultures…
Study the available professional literature in this field, write a short review of recent researches (approximately one paper, A4 size) and bring it to the class.
Sources
For the beginning, consult the chapters Searching for information and Literature.
Look at the bibliography in theoretical background of the previous practical class..
Look for recent professional and scientific works at the Google scholar service.
Documentaries and educational films dealing with non-verbal communication can be found by entering the relevant key words on YouTube service.
Important
At the practical class, research at least three different sources and estimate their relevance before using them. How to estimate the relevance of the source you can find in the chapter Searching for information.