Books with Ender as the main character go in this order: 1. Ender's Game 2. Speaker for the Dead 3.
Xenocide 4. Children of the Mind Books that occur in the same time frame as Ender's Game and before the events of Speaker for the Dead: 1. Ender's Shadow 2.
Shadow of the Hegemon 3. Shadow Puppets 4. Shadow of the Giant 5.
Shadows in Flight (more like a novella) Now, personally I preferred the second set of books to the remaining three books with Ender as the focus. You won't lose anything by reading all of the remaining Ender series or by first reading the Shadow series.
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.