Please get certified as an instructor wherever you live. Bringing new kiters into the sport is an important task and you should educate yourself as much as possible. Remember this, every student you train is a direct reflection on YOU. Your local kiters will either love you or hate you, depending on the new kiters that you produce, and their actions on the beach. If you're getting into teaching for the money, you have another thing coming my friend......It may seen lucrative, but factor in all the phone calls, pre lesson prep, scheduling, equipment maintenance/repairs, and 10,000 questions AFTER you finish with your student, you may begin to understand that there's no money in it. Don't forget all of the above is lost WATER TIME, and that is something that you can not put a price on!
If you choose to be an instructor, I wish you the best! I would recommend the IKO course, as it contains a HUGE amount of information, and it covers a lot of topics. You can get instructor insurance through the IKO, however it is NOT valid in the USA. To teach in the USA, you will have to obtain PASA cert. and general liability for 1 instructor will run you about 3600.00 usd per year. To become an IKO kite school, you must obtain Level 2 status to qualify, take a written exam, and maintain insurance on you and your boat.
Please get certified if you plan on teaching. Good Luck!