That version of Photoshop is several generations old, and, as noted above, may not work with current plugins like the Nik filters.
I'd also recommend Lightroom -- it has the latest Adobe raw processing tools (much better than CS3 for raw files), and the LR Print module is significantly more powerful than Photoshop. Yeah, it has a learning curve, but so does any software.
Then I'd recommend starting with Jeff Schewe's books, the Digital Negative and the Digital Print. These will give you a deep understanding of the printing process and let you get the most out of your prints before adding new plugins and other tools. At that point you'll be in a better place to decide what's missing, or what can be done faster and easier with different plugins.
Good luck and have fun.