As the class is about to start, you will see our students bowing as they move onto the mats, and then kneeling down in a row facing the instructor, who is usually wearing a black belt and is addressed as ‘sensei’ (pronounced ‘sen-say’). As a beginner, you will be a ‘white’ belt; this just means you have no experience in martial arts (or this style of martial arts).
The senior-most student will ‘call the bow’. For the first class, simply watch how this is done. Students remain kneeling until the instructor stands, and then the class will commence.
The class usually consists of basic drills to teach techniques, break falling (to prevent injury as a result of being pushed or thrown), and stretching.
Simply follow the instructions for the class, and watch how other people behave. It will become second nature after a very short time.