What the topic basically says but, your powers can be from anyone or anything you want.
Personally, I'd pick Edo Madara's abilities so that I may stop every war in existence in the world, shape the world into my own vision (for the better good), and create a utopian ruled under my power.
I'd pick Thor's power. He's very broken but not a reality warper. That would be almost so powerful it'd be boring.. Well maybe Franklin Richards would be cool. Ok Franklin Richards. Then I can do anything I can imagine but not really be God.
As for what I'd do, I'd banish disease and poverty, give a percentage of the world random super abilities, increase the scientific and spiritual knowledge of the race as a whole and see what happens from there.