You will earn revenue as per clicks on your ads. More clicks men more revenue. Just try to write good hubs and also one which may force your visitors to click on ads.
You don't have to do anything then. Just create more and more good quality hubs. The ads display in your hub pages are from your publisher ID.So when a user click in an ad you will get some money from google and that will be shared between you and hub pages.
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.