You need:



1) An external colorimeter (like the Eye1 mentioned, or some other device like Color Munky or Huey Pro)


2) Profiles of your reproduction situations (printers and/or photo labs)


3) Color Management For Dummies or something similar (not meant in a harsh way) but this is a good starting point for a color managed workflow and a color accurate monitor and reproduction colors. Please do know however that cheaper monitors have a more limited color space than the RAW files of your camera.