The Prince of Whales" "Great Brittan" "do I retain any title such as Lord, or Baron, or Viscount" "If so, do I retain the title of lord" It's kind of obvious that you're fairly uninformed on royalty and nobility. Being related to any member of the royal family doesn't de-facto make you royalty and doesn't just give you a title. Nobility is given through letters patent.
Prussia and Hesse don't have monarchy since they don't exist anymore. Royalty and nobility were abolished and titles were made part of the person's second name (See the case of Princess Marie-Auguste of Anhalt and Frédéric Prinz Von Anhalt). This, if anything, is your case for a title, but if it isn't your name you can just change it if you must.
Being distantly related to royalty doesn't mean anything. It's been conclusively proved that everyone from the UK is related to Edward III (Or some other Edward). It's nothing amazing.
In Germany, nobility and titles pertaining to it were abolished in 1919 making all Germans equal before the laws of their country. Titles were turned into surnames. The current head of the House of Hohenzollern, the former ruling dynasty of the German Empire and of the Kingdom of Prussia, the great-great-grandson and historic heir of Emperor Wilhelm II is Herr Prinz von Preußen or (short) Herr von Preußen.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.