Hi Craig, for a first shot that's a ripper! Congrats, and thanks for taking that first leap and posting your first image.. it'll get much easier from here on in.
If I can offer some advice, don't shoot in jpeg. Use RAW. You'll have much more control in post-processing and avoid compression artifacts.
It adds a bit to your workflow (and diskspace requirements), cause you may need to convert them to 16-TIF before stacking. I don't know if nebulosity can handle RAW files.
Have you looked at deepskystacker? It's a free image calibration and stacking tool. Very good and easy to use.
I look forward to more!
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