GET YOUR FEET WET 新しいことを始める

To get your feet wet is to start doing something that you have no previous experience in.
get your feet wet とは、これまでに経験したことのない、何か新しいことを始める、という意味です。

I realize that this is just an entry-level position, but think of it as a way to get your feet wet. You'll move up in the company in no time.
I got my feet wet as a writer by starting my own blog while still in college. Then, after graduation, I was hired as a staff writer for our local paper.
He only just started consulting three months ago. He's barely gotten his feet wet. Don't you think you should ask someone with more experience?

英会話レッスン We'll be wading on over here again, same time tomorrow, with the Wednesday edition!