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Hi there
For focussing for my D7000, I use nearby stars usually.
I normally crank the ISO to max in liveview and zoom in on the star.
Then just adjust focus until the star is as small as you can get it.
As for darks, just take the same pictures as your galaxy images (lights) in terms of exposure and ISO etc, but with the scope cover on.
Bias is taking shots with the scope cover on at minimum shutter speed - 1/8000s in your case (just to measure the read noise).
Flats are more difficult.
I am still learning too and have tried T-Shirt flats, where you take you take your imaging gear (exactly as you had it) and point the scope at a white LCD screen with a white T-Shirt over the scope.
I adjusted shutter speed and ISO to achieve a histogram that is roughly 1/3 from the left. (read off the internet)
It does work, but I'm not sure if it's better or worse than other methods.
Hope this helps
Cheers
Bob
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