Manually DL and install the 10.8.2 COMBO update.
Once that's in place, see these:
Switching from Windows to Mac OS X,
Basic Tutorials on using a Mac,
Mac 101: Mac Essentials,
Mac OS X keyboard shortcuts,
Anatomy of a Mac,
Switching to Mac Superguide, and
Switching to the Mac: The Missing Manual, Mountain Lion Edition.
Additionally, *Texas Mac Man* recommends: