World War 2 and me

I don't know much about World War II. The most I know is that Germany was the bad guys in numerous occasions and that America (Like Always) were the good guys. Adolf Hitler lead Germany to become a "Greater Germany". Germany not only lead a war but back home they created one of the greatest massacres to their Jews. Leading a mass genocide against the Jewish people known as the Holocaust. 

What I would like to know about the war is something different from the Holocaust. I think I've essentially learned enough about the genocide. I would like to learn more about the war itself. I don't really know too much about it. I'd like to know who was involved and what Germany's main plans were. Not only that but I'd like to know where America comes into play with World War II.