Here are a few of sites that could help you

http://www.write101.com/businessletter.htm

http://www.cyberbee.com/science/buslet.html

http://www.wisc.edu/writing/Handbook/BusinessLetter.html

Good Luck!!!

even in Asia today, a business letter should be businesslike, which means the accent is not on WHO you are, but WHY you want to meet this person So your letter should starts with the reason you want to meet; The product you have advertised is of interest to me. Would like to learn more about it. What would be the best time for you to discuss this with me, in person. Rather then write a letter, I would pick up the phone and arrange an appointment with the individual. Old practices are honorable, in its place, but in the business world time is very scarce, so rather then expect a reply by mail, setting up an appointment by phone is appropriate