Insulation for Entertainment Shed
Housewrap isn't a moisture barrier. It's an air blocker and drain plane that allows vaporized moisture to escape. Use either faced insulation or bare insulation with poly sheeting on the inside. Modern homes are build with poly sheeting sealed at all edges with specially-designed caulk.  

I'm not sure I understand your ceiling question, but typically it's done the same way unless it's blown insulation, in which case that's done after drywall.