I'm pretty new to this too, but may I recommend that you do not start with brightness/contrast!! If you have photoshop use levels (or curves if you know what you are doing) together with layers so that your edits are not destructive. Do as much as possible using adjustment layers until you are happy with the result. Only then "flatten" the image as a last step. Otherwise every edit you do detroys data that you will never get back.
I'm sure there are many books out there, but I'm liking the Scott Ireland book "Photoshop Astronomy." Bintel has this (or had it anyway).
Peter
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