Best settings for Nikon D3000 for shots of fire at night?

I've got a Nikon D3000 and a 18-55mm lens that I'd like to use to take pictures of a fire parade at nighttime. However, I'm very new to digital cameras and their settings so it would be really helpful if someone could steer me in the right direction of what the best settings would be. It does have a guide mode but I don't want to end up with a bunch of blurry photos of orange and yellow like last time, as there will be people walking around with torches and fireworks going off at the parade, and I'd like to capture it as best as I can.

If you're using your camera fully manually, which I hope you are (it's the only way you're going to achieve great photos), you should select an ISO of no more than 200, selecting a higher ISO of say 800 or 1600 will increase the noise in the photo but will illuminate darker areas. Next you'll probably want a shutter speed of around 1/100 of a second. If you want a large area in focus, select a large aperture (smaller f-number) if you want a smaller area in focus, select a smaller aperture (higher f-number).

Bare in mind that:
The higher the f-number, the smaller the opening of the shutter therefore allowing less light to enter the camera.
The higher the shutter speed, the quicker the shutter opens & closes.
The higher the ISO, the brighter the photo but the more noisy.

Try to find a nice balance between these three & shoot away, always checking your photos to make sure your settings are still working well.

ISO all the way up. 2000, 2500, something like that. Cam in M, aperture way open, shutter speed of 1/30 and fire a few test shots, see what you get. If your shots overexpose lower the iso to 1600 and then up the shutter speed a bit.

This kind of lighting can be difficult especially if it is very dark because of the high contrast. Very bright flames and dark areas with little fill light. Often you can get the best result when there's still a small bit of indirect sunlight giving you a base coat of light that helps lower the contrast ratio. Google the making of the Ron Howard "Backdraft" and you might find some comments on how they handled shooting flames, usually adding fill light helps.