Will users see post on their wall,if a post is made on app page?

No, users of your applications who are not fans of associated page will not get posts published on that page appears on their wall (associated page it's still a page, nothing unusual here).

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.