Listening skills are complex and we need to consider more than just what a coursebook may provide. We also need to rethink the classic TESOL/TEFL techniques that we learned in our CELTA course and roll out by default. Authentic materials and situations are key as well as scaffolding that is thoroughly applied to the actual learners and the learning happening right in front of you.
Part of being a teacher is also like being a camp leader. How a group bonds, how they manage cultural difference, and solve problems at a social level really affects your class. Language clarification aside, you need to have techniques, approaches and activities that help develop rapport.
These books on English language teaching are often on the recommended reading list given to you by many teacher trainers. Some may help with your pre-training tasks set for you by your tutors.