Yep, View NX2 is fine to get started. If you do graduate to commercial software, don't get Capture NX2 from Nikon. It doesn't do halfway near as much as the price would lead you to expect. Nikon do great cameras and lenses, but their software basically sucks.
@kaleidoscopeyes I thought you would have a Windows. I just assume it, if not noted otherwise. These programs are build for Mac OSX too. For RawTherapee, select what system you have. 64-bit or 32-bit, which Mac OSX version. The download page is: http://rawtherapee.com/downloads
· RawTherapee: http://rawtherapee.com/
· UFRaw: http://ufraw.sourceforge.net/
· Rawstudio: http://rawstudio.org/