Kegging is one of the best moves you can make as a homebrewer. It takes a little to figure all of the equipment out, but once you have it down, the work is well worth it. So keep positive and we'll help you along.
You basically need four things; a keg of beer, a C02 tank with regulator, a hose to get the CO2 into the keg and a hose to get the beer out of the keg.
While they don't focus on homebrew, Micromatic has a large video library that can be very helpful in understanding all the parts of a kegging system. LINK
The only real difference is that instead of using commercial kegs you are using Corny kegs with different connectors.
This is a good example of a starter kit (I purchased it and built upon it) - LINK.
That being said, if I did it again I would have purchased THIS
kit. It allows you to have (1) keg being served at low pressure and (1) keg being force carbonated at a higher pressure.
Please let us know what size fridge you have, how many kegs to you want to have on tap and any kits that you are thinking about and the group should be able to give you more specific advise.