Well the qualifications are simple
Flak gunner qual makes your flak gunner more qualified so more accurate - same with the gunner ( deck )
The radio qual means that your radio ops are better - they run the hydraphones as well as the radio\radar
Torps load faster with the torp qualification
Watch crew see better with theirs
Engine crew efficiency is raised when given their qualification
The repairs happen faster when that one given out
The Helmsman and Medic are a matter of choice
I bother with neither
I usually start giving out qualifications to officers then PO's
If you give those crewmen medals too it increases moral/efficiency etc even more
As to upgrades - well the bolds are a must when available
Bigger boat - better flak guns - all depends on how much you have to spend and what your aims are
If you dive every time you see an aircraft then no point upgrading to a Uflak as would be a waste of renown
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