With the 9000, for mounted slides, you'll use the FH-835M film holder - it takes 5 slides at once.
Using Nikonscan 4.0.2 is fine, does a good job. Clean it up in Photoshop.
Set the scan to 4,000dpi; 16 bit; Normal/Fine for ICE; Sampling 1x or 2x and do a few test scans first. For 35mm the files at these settigns would be about 100mb.
You can scan all 5 frames at a time. Good luck!