Your questions have more to do with piloting and basic Captain skills then mods. I would suggest you read the stickies in this forum under tips, tactics and TDC tutorials. But that's an awful lot of reading. So take your time and spend most of it on the sub just getting to know how it works from trying and doing.
Talk to the men and get to know the few basic functions they do. You can return to course simple by asking the navigator to do so. He will get you right back in course headed for you next waypoint. A Shift arrow left or right will get the sub in a hard turn.
The purpose of the TDC is to do all the calculation to set the torpedoes on the proper path. That means when the TDC has the proper input the torpedoes will end up where you point it at and at the distance you expect. However getting the proper input takes skill. Range,speed and AOB all have to inputted correctly if the computer is to do its job. That's where you have plenty of reading to do. Play with automatic TDC for awhile.
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