I know the basics, but I want to know more about both the governments (especially the Nazis) and the military. I thought about reading Chuchill's series, but I thought I would be outdated and it is unpractically long, as it would hold me stuck for months (and I got a very long "book line"). What do you guys suggest? Thanks!
Are there any more specific areas you'd like to know more about or simply a general overview? You mention that you want to know more about the governments and military, but that clearly is not specific enough!
If you want the most readable book I would highly recommend Richard Evans Third Reich Trilogy for an understanding of the Nazi regime from its historical ancestors all the way up to the end of the war. To me it is the best for your first point. Though you could just read the first if you only want their rise to power.