Looking at some of the finished builds will give you some ideas of threads to. then red the build reports.
As to "flat black"; I wouldn't ; try instead, very dark gray with a darker blend (mix in small amt. of black) for the shadow areas and a lighter (mix in small amt. of light gray) for the upper areas (dry brushing). After that has a chance to dry ,evaluate and add what you feel is needed.
Don't forget colors on switches etc. A good reference picture (or 2 or 3 or 4 or...) to see how the actual cockpit is colored on your perticular aircraft will make the job of color choice easier.