I like to start off this activity off by performing a quick demonstration with my JTE on the TV, by showing two of the worksheets side by side on the screen. After janken, we just take a couple of turns asking a question and marking either hit or miss on our own sheet in the "opponent's ships" section.
You can get students to draw as many or as little ships as you want. I usually do 2 x submarines, 1 x cruiser, and 1 x destroyer. Getting them to fold the paper in half so it looks more like the proper board also works well.
The names of ships might be different in the real game but whatever.
Also, I have included the word document in case you want to make any changes.
Reversing the order of "when you're" and "do you" also makes sense, but not with the punctuation I included. If students say it the other way I don't mind.