This site:
http://www.marginalsoftware.com/index.html
has heaps of very good and relatively actual information on using the 8000 and 9000.
The biggest problem I had with my 9000 was sorting out focusing problems. Still not perfect but miles ahead of what I was getting before.
As pellicle said: achieving accurate focusing will be the major factor in delivering a quality result with Nikon film scanners.
Nikonscan is not a bad piece of software. I still think vuescan will extract the best results but with the 9000 it's a bit fiddly and Nikon's software will get you there faster. Make sure you got the latest patch applied.
I've never been very successful with scanning in positive and reversing in an image editor as pellicle does. Mostly because I scan at 16-bit colour and none of my image editors will accept a 16-bit input file without downgrading it first to 8-bit. Which defeats the whole purpose of the exercise.
But with care in focusing and careful adjustment of the light source in the 9000, you can get a very good result straight out of the scanner.
And this touches on one of the major aspects of using the 9000, 5000 and V: rather than adjusting curves to balance colours and levels in the scanning or editing software, make your first port of call the changing of lighting levels (light sensitivity is the correct term to use) to adjust colour balance and histograms.
Only after you are happy with the overall balance should you then start fiddling with the Nikonscan/editor histograms, gammas and such: adjust the lighting on the scanner first.
And for b&w, just divide by 3.