What I do when doing night photos is something along these lines;
1. Manual Mode
2. Fairly long shutter time (if you go several seconds it will easily get blurry due to the movement)
3. 5-brackets to combine into HDR where you get more control of the lighting
I also always shoot in DNG RAW and I shoot in LOG-mode (for more dynamic range and freedom in post production. I think thats about it? And then; experimentation to see what works. It is not always equally light or dark when doing night photos.