There's a lot of experience and teaching hours here in FIA. Some have worked here for decades, some in various countries/work situations, and some have just arrived in Japan recently. However, despite our various backgrounds and work-related experiences, it doesn't hurt to hear a person’s way of teaching and dealing with students. Maybe you do some of them, maybe you don't, or maybe you disagree, but the point is you can possibly pick up something that you might think is a good idea to use for your work. So here goes:
DO...try to relate to your students. This applies to students of all ages. Establishing good relationships is the cornerstone to a good learning environment. This can be finding similar hobbies, interests like movies or books, or talking about their problems. By showing that you understand and care, they will respond in kind. Otherwise...
DO...be punctual in all things such as class time, start and finish. This is important for the student, since they have various other things going on in the day. Unless they aren't busy and wish to stay around, it would be best to try to be strict with the time. This is also important for you too. Work is about routine and discipline. You can avoid other seemingly non-related problems such as paperwork, using the restroom, and finishing up before leaving.
DO...practice what you preach. Nothing is worse than someone who teaches in a manner that he or she would absolutely abhor if taught something in the same way. Many of us have experience trying to learn a language. It is a good idea to ask yourself from time to time, “Is this how I would want to be taught?” If the answer is no, change your method or approach.
Don't...be a character, be yourself. This in my opinion is the most important point. I've witnessed some form of this in all of my previous workplaces. However, nothing tops the variety I've seen in Japan. Not only on TV and media, we now see this played out by teachers in the classroom. It is true that there is some element of entertainment needed in the classroom, but there is such a thing as going too far. If you plan on being a larger-than-life character, you'd better do it 100%, 24-7. If you lapse for even a short bit and reveal your “true” self, you'll be exposed as a fake. Then whenever you do your “jangle”, it will be met with derision and contempt. It's best to not go this route and just stick with who you are.
Don't...lose your cool or play mind games with students.No matter how they are with you, always remember that you as a teacher are supposed to follow the long and high road. When elementary school students call you names, remember they are children. When high school or junior high school students call you smelly, don't call them smelly back. Adults play similar games as well. The alternative is you going down a dark path. You'll become increasing more negative and hateful, and soon you will forget everything about your role and purpose. In the end, it will all backfire and suddenly you are the instigator and offender.
Don't...force your interests onto others, especially if they aren't interested. We all have many hobbies and interests, and of course we'd like to see if others feel the same. It is great when you do find a student that feels the same way as you do about music, movies, sports, exercising and so on. However, never let your class become about that particular thing. There are numerous reasons why you shouldn’t do this but I will stick with the important ones. One, they may just be polite and want to learn more about you. Two, our hobbies should just be a tool to promote their learning. If it doesn't fit, you need to drop it and move on.