Father-Son 1974 Duster Project

So while we're waiting to get Misty back from the paint shop, I'm thinking about what to do first when we get her home. She is a body on suspension with a power steering box.
I'm wondering what to do first. Gas tank and lines? Brake lines, booster and master cylinder? Wiring harness? Set the motor and transmission? I have most of the parts, what's the best way to go?