While AVS has some pointers, the big things are going to be you discussing what you aren't happy with, or what more you are hoping to achieve out of your display. You will also want to ask and research more about calibration settings with your TV to see if there are any known issues like color shift, black crush, white crush, clipping, etc.
I like the Disney WOW! calibration disc because it has very good tutorials that go along with it which can help you get things setup, but I'm not sure I would go to Best Buy for one of their guys. I would much rather dig through the (rather deep) posts at AVS and start looking for some better calibration tools and information from that site, which I don't typically recommend. But, we are a bit video limited here.