Heya,
Doing astrophotography with a 10 inch dob is not going to be easy, it can be done, but it will take some patience and practice. First of all, you have to figure out what it can do. You cannot take long exposure astrophotography with it, so that means no deep space objects (DSO). Your scope is very long, focal length of about 1,000mm or so I assume, which means the rotatation of the sky relative to you will be fast, and so it will blur when you try to take an image with the scope static pointing to a direction. This is why astrophotography uses tracking mounts. You cannot track with a dobsonian. But instead of talking about what you cannot do, here's what you can do: you can do lucky imaging via video while manually tracking a subject. You can either use your dSLR or a USB 3.0 camera of your choice, hook it up, achieve prime focus. Then, point it at the moon. Watch where the moon travels relative to the field of view. Move the scope so that the moon spends the most time in the field of view from one point to another. Practice doing that, and then roll some video while the moon is in the field of view. You should be able to get 100 frames or more maybe during that period. You can do the same thing with planets like Jupiter, which is out now. Just roll video while it's in the field of view. Do it over and over. Later, you'll take this video and stack and align it with something like Autostakkert!2 and create a single image from it.
Come on over to CloudyNights to learn more.
To truly start astrophotography, you're likely better off just using your dSLR and a short, fast camera lens and taking long exposures and learning how to do all this.
Very best,
:: My 
