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I stack different time subs all the time with DSS. Last night was 16 x 45 secs and about 90 x 30 secs, no problems.
Cola, are you tracking or guiding during your exposures ? 30 mins is a long time and without understanding what you are starting with it is hard to recommend a solution or method.
My suggestion would be to take maybe 20-40 exposures all the same ISO and length of the same target, say ISO800 at 30 secs each. Open DSS and add them. 'Check All' in the left side menu and register them then stack them. It will save an Autosave file but also save the image yourself in another file. Try M42 in Orion, it's bright and easy to find and now is agood time for it. It should show you a stacked picture and a histogram curve and rgb peak graph below.
For now forget about darks etc, get the basic process working first. Once you have that under control you can refine the process.
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