Where do you start?

Where does everyone start on their builds? I’m just starting my build/restoration on my 71. It cranks and will move under its own power. I’ve started on the brakes and the obvious stuff to try to get it to where I can drive it atleast. But after that, where do I start? The truck is in awesome shape, it’s just been sitting under a barn for 25 years. Any and all advice is appreciated.

P.S. I’m figuring how a lot of this stuff works as I goi just put my first set of drum brakes on this truck. I’m a small engine mechanic by trade, but have never fooled with trucks much other than the basic oil changes and basic stuff. So forgive my ignorance.