as I told another poster recently about Nikon settings:
-Exposure mode 'A' and set aperture to f/8. Don't touch the 'scene' modes, that's not what you bought an SLR for.
-ISO 200(highest quality ISO setting with lowest amount of grain)
-A(will detect when what you're shooting is still or moving for you)
-Matrix metering(meters all of your scene not just the center)
-shoot in jpeg fine(can view on your computer right away as opposed to RAW)
-continuous release mode(shutter keeps firing when you keep your finger on the release)
Also, for that 80-400mm, I would engage the focus limiter switch so that your focusing speed improves a little. If your subjects are ALWAYS moving, I would use AF
-C instead of AF
-A. At least until you get comfortable recognizing when to switch that on your own. Don't shoot in RAW unless you have a converter.
I don't have personal experience with the 80-400mm, but the D90 is an excellent camera. For what it is, the 80-400 does very well based on the photos I've seen taken with it. Enjoy