Oh Karl .... there is a lot of work for these models.However, the first one I mean the P-50 Hawk should be of bare metal colour.I think you can use ther silver or aluminium or even a mix of then to paint it.There is a few pics of the plane prototype only.And all these show the aircraft partially.Some years ago there appeared a couple of pice from Germany with not finished ( desolate ) aircraft frame.These pics were taken after the September campaign 1939 in Warsaw.I think the kit needs some serious corrections.But if you can assemble it quite precisely and paint smoothly it can be a nice model.In addition there aren't any close up pics of interior or accurate drawings for making the model better.
The second one is P-23 Karaś but it is a very very old kit.Personally I prefere the Heller one to this kit.What can I say, sanding, sanding, putty, putty and filers thase are the main tools for the build. Paints for the model can be
khaki II - Humbrol 26 or 142, Testors 1702, Tamiya XF52 or XF64, I suggest Polish acrylic paint Pactra A23.
light blue-grey - Humbrol 124 or 65, Tamiya XF66 or XF23, I suggest Humbrol 127 / Pactra A85 or Pactra Polish Blue I or II / A68 or A70.
Interior - khaki.
The last one is a kit of RWD-8. It is the nicest kit here.Quite easy model to assemble.Some corrections also are needed.Colours also not too many there.Khaki II or khaki IV(red-brown,rusty - there is no accurate info on it), silver or aluminium paint on the engine cowling.The interior colour depended on a factory and could be light blue-grey or khaki or silver.The most important thing is to know if the real RWD-8 you want to make the model, was of RWD factory build or PWS' because PWS used a different exhaust pipes on the bottom of the engine cowling.