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To get an idea of focusing etc with a dob and camera, try taking some daytime shots. Try birds on the telegraph wire and distant buildings. Then when you are happy with that, do the moon. This will help you learn to focus. It will also give you an appreciation of how sensitive your scope is to vibrations and wind. This can be fun especially when you consider you scope is (@f6) a 1524mm telephoto lens!
This will give you some helpful practice.
IMO you are trying something very difficult at the start and I wouldn't want to see you fall into the trap that so many people fall into. That is you try something really hard then get frustrated and soon give up.
Try to do some 50mm or similar shots with a tripod and stack them. You should get some Milky Way and deep sky objects and this will give you the experience and enthusiasm to continue.
I have been doing AP for 15 years and I'm still in no hurry to do prime focus on a large reflector. I am kept quite busy by a 530mm Refractor.
Is your mount driven in any way? If not you are probably never going to get sharp stars even on exposures as short as a few seconds at prime focus.
Please consider my hints at the top. Astrophotography is probably the hardest form of imaging and you will need to take some time to get where you want to be. Good luck. PS post any terrestrial shots you take with the dob too so we can see how they look.
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