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Les,
I don't use DeepSkyStacker, so can't help you there. I'm sure there's lots of tutorials on the home page.
The general idea, however, is that you want to calibrate your 10-minute light frames, with a 10-minute master dark (master dark is a median combine of all your 10-minute darks). Then, do the same with your shorter exposures; calibrate your short exposure light frames, with the equivalent length master dark.
Once the images are calibrated correctly with the dark frames, and a master flat frame (you will only need one master flat frame, which would be made by median combining many flat frames), you can then median combine the entire lot together.
Example:
10 light frames of 10 minutes each;
10 dark frames of 10 minutes each;
median combine your 10-minute dark frames into a master dark frame;
calibrate (subtract and flat field) each 10 minute light frame with your master dark and master flat frame;
10 dark frames of 5 minutes each;
10 dark frames of 5 minutes each;
median combine your 5-minute dark frames into a master dark frame;
calibrate (subtract and flat field) each 5 minute light frame with your master dark and master flat frame
Now, at this stage you have a completely calibrated set of 10-minute and 5-minute exposures.
You now median combine the both of them for your final stack.
Regards,
Humayun
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