Knowing how to say 'thank you' in any language is one of the first, and best, things to learn. The gesture is immediately appreciated, especially in Japan, which is an extremely polite society. The Japanese take great pleasure in people from other countries making the effort to communicate with them, so don't feel shy about trying out your Japanese. The more you practice, the easier it will get and the more you will be able to communicate with people. For more on Japanese Greetings, follow the link. Keep practicing your Japanese!
Thank you very much.
Listen to the audio file for "Arigatou gozaimasu."