I'm pretty much guessing here, as I don't have experience with roller bearing headsets.

I would think that 1 fits between 3 and 5 (in the orientation in the picture, 3 then 1 on top then 5 on top of that). Similarly 2 fits between 4 and 6. Presumably, each roller bearing (1 and 2) is generously greased before going into their stacks.

I would think that the wide end of each bearing stack (5) would go closest to the headtube, fitting in the pressed in part, but I don't know what the pressed-in part looks like. The compression ring would then nest on top of part 4, with tapered side down.

Presumably, there's also a fork crown race that you've already installed, and a star fangled nut, bolt and top cap (or equivalent) to apply preload. Not sure about 7, it's hard to see clearly in your photo.