As a teenaged intern, how can I make a good impression at a law firm?

This summer I’ll be interning at a well known law firm in New York. Not only am I nervous, but as aspiring lawyer in the future (I’m in my mid teens now) I’m incredibly excited.

However, I’m not sure what I am supposed to expect, or how I can impress these lawyers, as I’ve never been in this kind of environment, or worked before.

Thanks so much for any advice!