Get a 20 pound tank and use the 5 pound you usually get in a kit as a backup. You will be running to get the tank filled 4 times as often with the 5. Trust me, I'm a pro. No big deal, drill the holes and install. Usually just need a hole saw for the tap, It may be 1".
Get a nice tap handle to match the brew and enjoy.
No cans or bottles!
And like some of my paranoid friends say No cans and bottles for the neighbors to see. lol
I have a five pound tank and keep my pressure around 15. It usually lasts at least 6 kegs sometimes I get 9 out of it. Do your self a favor and buy the gauge that tells you how much gas is left in the tank. That helps alot. Advantage rental in Seaville will fill your tank.