The best resource you probably could find would be a book or 2 authored by a former Uboat captain.
The other issue you may find, is what the captain did on the ship, varied between captains, as some would be more hands on, and others would give orders and let the crew do most things.
Typically the captain would be the one who read the orders from command, occasionally would have to operate the enigma himself if the orders were for the captain only to read, he would control things like the periscope and TDC binoculars, he may also participate in watch shifts on the conning tower, and he mostly gave orders to the rest of the crew, such as speed, depth, heading, course plotting (sometimes he may do it personally), silent running, opening torpedo doors and firing, and pretty much everything else that happened on board ship that was important (though the XO may also handle some of this stuff too as would other junior officers).
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