If you fly something not attached with wires/strings (anything, not just "drones"), and it weighs more than .55 lbs, you must be registered. Start here:
https://www.faa.gov/uas/recreational_fliers/
Note that you are registering yourself, not the craft - you would put the same registration number on each of your aircraft.
Most (but not all) clubs and the A.M.A. generally take the stance that they are not in charge of policing the rule. A few do, though, demand proof of registration to join. So generally whether you will go to prison for life if you don't register mostly depends on what official law enforcement you have a run in with.