Throw yourself in at the deep end ! I did and you will learn very quickly although it'll be a bit frustrating at first.
Some essential tips
1: In areas where you think air attack is possible, don't go over x256 time compression while surfaced.
2: Don't save and exit the game while under water.
3: If you are near the English coast, be careful of those mines.
4: Night and rough seas are your friends. Heavy fog can be deadly.
5: Learn to sail 'decks awash' (set depth to 7.5 meters).
6: Make sure your tubes are open before launching torpedoes.
7: Launching at targets between 400 - 1000 meters is best but never less than 400 meters.
8: When detected, get deep quickly and then worry about being quiet.
9: As you know already, avoid shallow waters.
And most importantly the old proverb - There are old captains and there are bold captains, but there are no old, bold captains.
Good luck !
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