First I would suggest you purchase a tripod and a remote cable to prevent unwanted movement of your camera. Then download and print out your settings for the camera to take with you. There will always be other photographers to help you on such trips, but basically look at the following as a basic and tweak as you go along Go into settings and select manual. ISO 1600 Aperture f.stop 2.8 ish Shutter speed around 18-20 seconds Zoom in/out to get correct focus and shoot using remote cable. I am not familiar with Nikons so cannot help more specifically but your instruction manual should enable you to work out how to do all the above. The other thing is to set the camera settings up BEFORE you expect the lights. They can last a few seconds only or for much longer. Mother nature makes the decision on that one. Enjoy
As Izabella says, "set the camera settings up BEFORE you expect the lights." - for one thing, it will (obviously) be dark when you see the lights, and you don't want to be fiddling with settings in the dark and trying to actually SEE the merry dancers as well as photograph them. It could be very cold, too, and your fingers won't be so nimble.
I did a Google search with Northern Lights photography nikon and a whole lot of web pages came up with helpful advice.
It would be a good idea to try a few practice runs beforehand of night shots that include dimly lit clouds or some such thing, to get some experience of handling the camera in similar conditions.
God luck. When I went to Iceland, the only night the lights appeared the weather was so bad that the planned trip out away from street lights had to be cancelled.