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Very nice Chris. The first and last image though looks heavly black clipped. That means the left hand side of the histogram (where all the dark areas of the image are) has been cut off in the processing.
So one tip is to either watch a histogram while processing and leave a bit of space to the left of the histogram curve so you are not deleting the dimmer parts of an image. Particularly important in Astrphotograhy image processing as you have lots of dim details in almost any image.
Ron Wodaski's The Zone System is a good astrophotography Photoshop based CCD oriented processing book. For DSLRs the bulk is the same but most use the free Deep Sky Stacker to stack images. As far as flats and darks go I don't think they are needed for this type of work. Just set your camera to long exposure noise reduction on for incamera darks (it doubles the exposure time) and as far as vignetting goes Lightroom and or Canon free software should correct for that. Flats is more for CCD imaging. DSLRs usually only suffer from lens vignetting which is easily corrected. Some do it automatically as an option in the menus.
Alternatively watch Louie Atalas's free processing tutorials. They are about Photoshop but they are excellent.
Greg.
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