Will you be teaching on or off-line? If you will be teaching on-line, you need to make sure that your web hosting server is supported in all the countries that make up the region where your students reside. I know for a fact that the Chinese government blocks the vast majority of free web page hosting servers, including GeoCities, Yahoo, Tripod, Homestead, and Lycos.
Without a question, your first class should be an initial assessment of your students' linguistic proficiency. What are their names? Where are they from? Are they learning English as a second language or a foreign language? Do they know dialects of a given language? What do they do for work, school, hobbies, and pasttimes? Outside of English, what would they like to learn about?
This communicative assessment allows you to get to know your students, measure their English proficiency, and for you to extract insight about if they are primarily left or right-brained individuals while investigating your class' multiple intelligencies. Even if you are asked to perform a demonstration class, I highly recommend administering an initial assessment because you will only get one chance to make a first impression, the students will be assessing your skills, and you will be performing an initial assessment of your students in the background whether you realize it or not.
Moreover, to get a quick overall assessment of your new class, you may wish to take advantage of one image, displaying the picture in the classroom to the best of your ability, and utilizing the aforementioned image to determine your class' vocabulary level: ask for one noun per student and depending on the number of students you have in addition to the time you have on your hands, give every student several opportunities to show you what they know. Brief audio clips only enrichen this activity.
As far as Asian adult students, the teacher traditionally has absolute power in the classroom and is the pinnacle of enlightened knowledge. However, depending on the type of school you find yourself in, the teacher may be treated more as a civil servant nowadays with parents being at the top of the food chain. The Chinese Little Emperor syndrome is at fault and only worsens this trend.
Normally, at the junior high and high school levels, Asian students are bombarded with instruction about the English phonological system. The vast majority of schools recognize and respect the International Phonetic Alphabet, albeit outdated with little to no training in phonetic transcription. My advice is to transcribe a word phonologically and ask your students if they understand these strange symbols. Afterwards, write the same utterance with the phonetic transcription. My money is down on the fact that they will not understand the indepth details of advanced transcriptions.
Don't treat Asian adults as children. Treat them as equals if you really wish to earn their respect. Culturally, elder students should also receive the proper amount of respect. If you address an elder student as "sir" or "ma'am", you are well on your way to making a fabulous first impression, laying an academic foundation for trust in your classroom.
Finally, if you have any more questions, feel free to visit me working hard in my on-line school. You can even open a secure chat window with me, if I am on-line, by clicking the green "Live Help" button.
Eric Paul Monroe