You can snap your fingers tomorrow, and it's the day after the revolution, time to sign the Constitution. How does it work?

Assume total creative control, but once it's written it's in the hands of the general population. They will eventually twist and distort it any way they can.

ETA: I should have been more specific. I'm looking more for basic structure, not policy. Monarchy, direct democracy, democratic republic, that angle. Should everything be a pure democracy referendum? Should we delegate to representatives? How much power do we give them? How do we delineate governmental strata (nation, state, county, city, neighborhood, etc.)? How do we allocate authority to those strata? How do we divide powers, and how do those powers check one another?