You can use RAW in DSS. Works well. Dark frames depends on yourself really, you can take one after every image or whatever. I tend to take 2 or 3 before and 2 or 3 after my light frame exposures. I also do the Bias and flat frames after my imaging session is over, but this is purely my preference to do it. DSS has a helpful help file which guides you through, but I experimented and found out what works for me.
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