The same way it has worked in the US.
Total media control, "feed" them only 1-2 hours of TV a day, one channel, obviously state controlled, seal off ANY outside information, no radio, no TV, no internet, no newspapers, feed them patriotic messages everyday, make any free country and their values look evil,detain, incarcerate or execute whomever talks anything bad about the leader( or worse, detain their families and punish them for the "crimes" committed by one their family members) have a secret police where your neighbour or your best friend might be an informant rat on you for a loaf of bread....stuff like that,pretty simple. You guys have NO IDEA what it REALLY means to live in society like that. It's pretty scary .....
What communist country did you used to live in?