Based on your description, I gather that your kegerator will come with the necessary equipment for a Sankey setup, such as pictured here below:
And since you are planning to hook up corny kegs, you'll want to swap out the Sankey coupler with corny disconnects. Comparing the first picture with the picture below, you can see how simple the change is... You will likely have to cut the lines to attach the new disconnects, but it's pretty straightforward. You'll basically just need a gas disconnect, a liquid disconnect, and a couple of clamps to make the change.
Although I have not personally dealt with www.kegconnection.com
, I have heard lots of good things, and they have all of the parts you'll need (plus they unknowingly supplied the graphics for my post, so they'd probably appreciate the business). Most LHBS and online retailers have these parts as well. Hope that helps! Good luck!