Titles are somewhat important although he use of first names when addressing someone in quite common. To be safe it is best to address people by using their professional title or Mr., Mrs., or Miss, followed by the surname.
It is advisable to have one side of your business card translated into Thai and be sure to present and receive business cards with the right hand only.
Look at business cards you receive them with interest by examining them carefully. It’s best to place them in a holder and be sure to never write on or fold a business card you are given.