A big mistake I made when learning VBScript was the purchase of the Windows 2000 Scripting Guide ($49.95). It's a great resource, it sits on my desk, and yes I still use is frequently. So why was buying it a mistake? Because, the online version is available on Microsoft's site, for $.00. Before purchasing PowerShell books I checked Microsoft's site, guess what? Microsoft has made available the "Windows PowerShell 1.0 Documentation Pack."
First step: Download and Install PowerShell 1.0.