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Moon is quite easy with DSLR but not the best option. ISO200, 1/125th but try various combinations. The moon is so bright in some areas but almost pitch black in others. I take about 20-30 shots, pick the best to work on. You can stack them with Registax (free) to improve resolution. The atmosphere tends to blur the details and this helps but moon photgraphy is normally done from an avi file from a webcam, not a DSLR, same for planetary.
Star trails are the easy ones, just a longish exposure or multiple exposures accummulated. There is software to do his but I haven't gone down that path myself. Widefeild is also an option here. Higher ISO and exposure not so long as to show rotation. The wider the lens the less apparent it is but it will accumulate the Milky Way star fields and some nebula clouds.
Planetary is best done with modified webcams, high magnification and stacked video (avi). They are normally too small to be well captured with DSLR although modern DSLRs with video capability are being used to see how they go by some.
DSOs which you haven't mentioned, are good subjects for DSLRs. Semi-widefeild as they can quite large and long exposures to capture enough photons to be useful. Guiding and filters become important in this area. This si the area I am most interested in and also in many ways the most demanding.
There are many postings and advice on here in both the forums and in Projects and Articles on the various forms and practices of astrophotography. I suggest you read some of their threads to understand and learn the techniques and pitfalls of which there are many.
Expect it to be both a slow path and an expensive one as I have found.
But fun !!
Your EQ6 will be capable of guiding btw, good, you'll need it if the bug gets to you.
I ama serious photog myself btw. Motorsports mainly.
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