Reddit reviews PowerShell in Depth: An administrator's guide
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I'd suggest reading Powershell In Depth - http://www.amazon.com/PowerShell-Depth-An-administrators-guide/dp/1617290556
You can probably finish it in less than a week of train rides. A lot of that advice I had to learn the hard way.
Can I ask what you're trying to accomplish with a WSUS Offline deployment? Are these air gapped machines?