The premise is thus;
A neo-nazi time traveler with a ton of money to throw around who's also done a ton of research into the manufacturing, mechanisms, and uses of nukes, brings a few construction crews back in time to 1920s Germany and begins building 10 modern-level ICBM manufacturing and launch facilities in discrete corners of Germany where they won't be noticed, at least not at first. By the time all these facilities are finished, it's August 1934 and Hitler is about to merge Germany's chancellorship with its presidency and become the Führer of Germany. Don't ask how these facilities managed to go undetected for all that time, at least for now; they just have.
Once Hitler becomes Fuhrer and establishes himself (but before WWII breaks out), this neo-nazi time traveler informs him, via anomalous letter, of the facilities he's constructed, including the 20 or so armed-and-ready-to-use nuclear warheads and matching ICBMs contained in each and what they can do. When the Germans inevitably check out the facilities, they quickly discover that this is no prank. There are, in fact, 20 nuclear warheads in each of these 10 facilities, along with guided missiles that can carry those nukes to pretty much any corner of the globe. In addition, each facility has a book in it containing detailed instructions on how to arm these nuclear ICBMs, launch them, and send them where the users want them to go, in addition to instructions on how to use the facilities to manufacture more nukes if they ever run out, and several other books containing detailed breakdowns of every piece of 21st-century technology in the facilities, meant to help speed along reverse-engineering.
As a result, when Germany does kick off WWII, it enters it with 21st-century-level Nukes and ICBMs at its disposal. Purely for the sake of making this question somewhat answerable, I'm going to assume that Hitler does the smart thing and lets his generals decide how to use these assets and that the generals don't let this power get to their heads and develop an action plan in which the Nukes will be used to bring all powers unaffiliated with the Reich to their knees as quickly and efficiently as possible.
My question is; What exactly does this plan of action entail? Or, in other words, What would be the quickest, most efficient way for Nazi Germany to use its 21st-century-era arsenal of nuclear weapons to bring about the Axis's complete and ultimate victory in WWII? Note that I'm asking for the absolute BEST way to use these nukes to conquer the world, not the