If your camera does not have a mic input, then you don't have many choices. Do it like the pros do...turn off the cameras microphone and use an audio recorder with a quality mic then use an editing program to blend the audio and video together.
You use an external audo recorder... B&H has them starting at about $90. You then turn off the audio in your camera (if you can) and add in the external audio track in post processing.
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.