Minasan, konbanwa.
みなさん、こんばんは。

Ogenki desuka?
おげんきですか。

We learned self-introduction a long time ago, but in this you tube video you can see how it's done in Japan. There are some expressions that you haven't learned yet, but don't worry. Just focus on the bowing part and the expressions that you learned in class.

http://www.youtube.com/watch?v=dltAqqg8vPw&feature=related

In this video, you'll meet Eline from England. She's studying abroad in Japan.

http://www.youtube.com/watch?v=aef_g90p6BM&feature=related