Total Noob with some Questions and Trouble

[U777]

How the hell do you complete a patrol mission!? Once I do a patrol my orders say both complete, but when I go back to the dock, nothing happens! I have to save then exit then I get another patrol, is this normal?

Yep you have to actually exit the patrol, there is no mission complete screen because a patrol can last as long as you want it to last.

How do you attack from underwater? If im below perascope depth how can I lock a target to fire a torpedo?

Stay at periscope depth, and since your new simply use the weapon officer to get a firing solution then hit the fire button. However hit the Q button to open the tube before getting the solution. The extra seconds needed to open the tube can mess the solution up. You cannot lock on a target below periscope depth and once you get below 25 meters you really cant shoot anyways. However you can use the hydrophone to get a ship's location on the map.