I suggest you use Singhg5's method of drawing a picture of the right side cover on a piece of cardboard with a hole for each screw. Then, when you remove the screw poke it into the corresponding hole.
These screws are different lengths and it's easy to get them mixed up.
+1.
Rich, I recently did this to change my drive sprocket.
When I pulled the cover, everything was in order and obvious, except a black plastic spacer dropped to the floor. It was the "gear lever shaft spacer" which affects the gear shaft's sideways play that was mentioned here earlier. Mine seemed to have mildly deformed to fit the space it filled, but it looked intact enough to me, and I had just a hair over 1mm shaft play, that I just re-used it.
Have a care and you probably could re-use the gasket. I had the job planned in advance so I had a spare on hand. Where the wires for the "magneto assembly" (parts catalog wording) passed through the seam between engine and cover, there was some silicone sealant which cause the gasket to try to adhere to the cover rather than the engine side (IIRC), so watch for that if you're going for gasket re-use...