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As Ken & Glen say, start slow and build up. It is not an easy 'jump in and go' path.
Your 12" DOB is not a good photographic starting point. Better is a smallish refractor and DSLR and T.Ring. 10 second avi movies of the moon, Sun spots ( Baader filter required of course) and Planets. Any of these can be accomplished with a decent tripod for short videos that can be stacked and processed although better of course is an EQ mount. My first was a little EQ2 with a brick hanging underneath to steady it.
High ISO might give you acceptable Globulars in single frames through the DOB.
Nebulae and Deep Skly Objects require a mount, the bigger the better. Minimum would be EQ5 but an EQ6 is better. And from there still continue with the smallish refractor. My 80mm f11 Skywatcher Achro actually produces quite good planetary videos although my main imaging scope is 102mm ED f7 Lunt. The 80mm f11 is normally my visual checking scope.
After that comes guiding, connectivity, AND THEN you better have gotten processing under some control because you will have heaps of images and need a bigger PC.
The DSLR, Refractor, tripod\mount will get you going. Get a T-Ring and try the globular single frame suggestion.
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