Thrilled with the new Imac. I lost "Downloads" from the dock, a very interesting thing on this computer and trying to figure out how to get it back. So much new to learn, The best way?
Also have a look at the following links, as the information presented there might be helpful in your future endeavours into Mac OS X and could clear up initial confusion and may even prevent harm to your system or your files.
Mac OS X Basics
Switch 101 - guide with articles made by Apple on how to accustom yourself, after you switched to Mac OS X from Windows