What should my settings be on my camera for night clubs?

My friend wants me to photograph her dads bar tonight and I've done it before but they came out really noisy and I wasn't happy with them at all. I have a nikon d3000 digital slr, I have two lenses but I'm only using the smaller lens because it's a small club. Last time I had my iso at 1400 and my aperture at 5.6. I had my flash on at 1/8 of a flash. What should I do differently tonight?

In that dark situation about the only thing you can do is set your camera to manual, run the shutter at 1/200 - sync speed, your aperture at the lowest that lens will do and run your iso as high as you need it. That means experiment.

You are going to get noise at that level of iso.

One thing I do in lower light is use the settings above with flash and then edit them for brightness and contrast. You'll be surprised how much detail you can bring out in your edit software.

Best advice is to leave your camera home. A bar is a perfect place to get it knocked around.

Aperture 5.6 is the problem there, use the smallest f-stop. If you have a fast lens, such as f1.8 or even f2.8, it will do a great job.
Use a tripod and go slower with shutter, if there are no people moving the shot, use something like 1/20, you won't even need the flash, if people are moving in the shot, use around 1/150.
Shoot RAW, and adjust noise levels in post-processing, use warmer white balance, and if you use adobe lightroom, using the "fill light" bar might bring out some details.
I suggest trying above and start with an ISO 800 and up. Even if you come up with a few very noisy photos, turn them into black and white, grain looks good in b&w.

Hope this helps, practice a few times with these settings at home first.