You will need gas line from your regulator to a manifold if you have more than one keg. That length will depend if you decide to have your air tank outside or in the fridge. Then gas line from the manifold to each keg. Usually between 3and 5 feet.
beverage line...10 foot for each keg.
taps, either picknic taps or faucets. If you go with faucets, you will also need shanks and tail pieces for each one.
hope this helps.