First thing I would say is do you live in an area with a lot of studios to get work at because if there isn't you are out of luck but if you are near them I would say you will just have to agency by agency doing research on them or find someone who already does voice acting and ask them for tips.
Look on the AFTRA website then click on your nearest big city aftra.org/1098020CF8E64E9E801… Agents with a "V" or "All Areas" under their name represent voice actors. You will need to put together a demo reel in order to apply to an agent.
Agent sees your work, calls for interview; recommended by casting director, producer or fellow actor, send portfolio to agent.
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.