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Hi Peter,
If you’re Imaging in RAW format then all of your white balancing can be done in post processing. Simply select a region of sky with no apparent gasses or stars ( so black ) and set that as your neutral tone ( even levels of red,blue,green ). Not black because that will make space “ black “ ( 0,0,0, colour ). If you do want to set your white balance in camera, this needs to be done by sun light not by artificial white ( your flat panel ). You can get white balance cards from camera shops. They consist of a white, grey( neutral) and black card. Take a photo of each card while the sun is directly above and then use that to tune in your white balance.
As far as flats, darks and bias. I’ve never used bias but that’s not to say it’s not worth it. Flats and darks really do improve image quality though.
Hope that helps
Cheers
Ryan
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