I'd start with minimizing the cultural memes of self-aggrandizement and entitlement. Eg, having a Facebook page doesn't make you a reality star. And greed is bad.
I'd cherish and reward acts of charity, kindness and compassion, as well as long-term, intelligent and altruistic planning for the benefit of all humankind. I'd hail good, effective teachers and scientists as the new rock stars. Singers, movie stars and pro athletes would all be on the back tiers of importance.
Moral relativism/equivalence would end. Political correctness would get a major overhaul to minimize oversensitive wussiness.
I'd insist on people taking personal responsibility for their own lives and behavior, not just ranting about rights. Rights w/o responsibility = recklessness; responsibility w/o rights = slavery.
And yeah, if necessary, scorched-earth would be part of my foreign policy.
In time, my stern but ultimately benevolent monarchy would blanket this world with sufficiently distributed resources for global peace and prosperity.
Oh, one last thing: I'd fund research into resurrecting a Jack Kirby clone. Man I'd love to see what he could do with today's computers and art programs.