Last night, I had mine set on a tripod, 35(ish) mm, 10seconds, ISO 12800, f4 (yes I was pushing limits).
The ISO was really so I could minimise shutter speed. I tried slightly more, but the 500 rule seems to be more of a 400 rule for me for some reason. I got Milky Way reasonably clearly in mine which was one of the big things I wanted, but had I not, I wouldn't have had to push ISO so high.
As for shooting, I found it to be spam shots. If you're on a tripod, if you see one, by the time you've hit the shutter, it's gone. And you can't have your camera pointed at the whole sky, so pick your area and hope.
Going to try and look through my shots tomorrow I think.
kd