Just watch my videos. They are more instructive than Admiral Robbins' tutorials which have gained widespread fame because he sinks lots of really big ships. I never sink any and rarely hit them. Once you see what I do, don't do it and you will have great success. Nimitz will redecorate your office a la Lane's post, promote you, and you will retire a hero.
Tonight was typical yada yada. I chased a tanker for two hours, hit it with my last four torps, followed it for three hours, forgot to feed my three dogs, the dominant male got hungry and peed on my leg, the tanker did not sink, I went to get some dog food to feed the dogs, and while I was gone my boat ran aground off Singapore and sank.
On second thought, maybe you ought to stick with RR, Werner Sobe and tale.