Just like if you are hosting a party work them room before the start of the class. Get to know your audience a little bit and be present in the moment with your class. If you are unsure, you never want to embarrass yourself or the student, learn to pronounce names you are unsure of.
Be clear in syllabus about objectives and materials that will be covered, be prepared to answer questions that may arise. Understand no question is a dumb question even it the answer is in the written materials.