It depends on what boat you have. We'll go with a Type VII since that's what is used in the training. The first 4 tubes are all pointing forward, and tube 5 points backwards.
When you're looking through the periscope, the bearing indicator at top is always in relation to your boat. 0 degrees is directly in front of you, and 180 is always directly behind you.
When you're firing torpedos in front of you, you probably want the target to be somewhere between 345-0, or 0-15 degrees on the bearing indicator. For rear shots, 165-195 should do the trick. You can actually fire at more extreme angles than this, but the torpedos are less likely to hit. You should also try to line your boat up so you're looking at the side of the target for the best chance of a torpedo exploding.
Hope that's enough to get you started.
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