Being anonymous and all, I would like to recommend two/three most excellent books:
-The rise and the fall of the Thrid Reich, by William L. Shirer. This book is fantastic! All you wanted to know of the German stirde to power and their downfall is in here. Has won alot of awards. Should last you 6 months.
-The second world war [a very innovative title] by martin Gilbert. This book has a more general overview and is more focused on the how the civilians and soldiers had it during the war.
-Rommel as military commander, by Roanld Lewis. This book has the biography of herr Rommel and all the tactics he used. The book I have is rather old (1968), but it is probably out there somewhere.