If you want to do a basic calibration, I would pick up the Disney 'WOW!' Blu-ray calibration disc. It will give you a chance to understand some about color and getting things correct. At the end, there is still user preference involved, but it will help you avoid crushing your blacks, blowing out your whites, and maximizing your contrast. It will help you avoid over-sharpening the image as well, which some people love to do.
It's inexpensive and a good starter disc for calibration. You can do it several times and will save you a lot of coin vs. paying for a 'pro' calibration which you may not be super excited with.