Good, sounds like you're on the right track. I am skipping bottling and going straight to kegs.
Cornelius kegs are stainless steel 5 gallon kegs used in the soda industry. There are two styles, Coke and Pepsi, that differ mainly in the connections on top (pin or ball). Pepsi (ball) is the home brewers favorite. This is handy so that when you go somewhere and bring your beer to share, the connections will fit.
CO2 pushes the beer out of the keg. You need a CO2 bottle and a regulator, some hose and connectors. On the liquid side you can use a short hose with a picnic tap, or you can get all fancy and put through the door taps in a refrigerator like I did.
Also, the keg can be used for conditioning the beer, or if you're really anxious to taste your brew, to force carbonate at a higher pressure.