[dad911]

Tevake- depends on level of finish desired and budget. Lucky you don't have to worry about snow loads.

As a start, I'd think about a layer of plywood on the rafters, spray on or foam board insulation, and tie the roof to the walls with metal strapping (hurricane)

Nicer finish would be ceiling joists, batt insulation, and sheetrock.

crbo7 - Is it common practice in your area to put plywood between two moisture barriers ? Does that moisture barrier breathe? If humidity can't escape, the wood will rot. Seen it quite often around here in walls, before tyvek, people were putting a plastic vapor barrier behind the sheetrock, combined with tar paper under siding, walls would retain moisture.

That was also part of the problem with eifs stucco, elastomeric coating too tight, moisture trapped against sheathing.