Indoor/Bar photography with no external flash?

A friend of mine requested that I take some photographs of the bar she works at. I've told her ahead of time that I would need an external flash to do this properly, but that I do not have one. She still would like to get a few shots anyway. I told her they would be free because I've never attempted indoor/bad photography.

I have a Nikon D60 with a 35mm f/1.8 Nikkor lens as well as the 18-55mm kit lens.

I'm wondering what settings (ISO, etc) would be best to shoot in. Please keep in mind, that my camera does not handle noise well past and ISO of 800. Also, AND AND All other suggestions would be greatly appreciated.

Added (1). Yes, I know how to check white balance, but feel free to elaborate. It's always nice to have reminders.

Start at 1/8 at f 1.8. Do a white balance for the light source in the bar. Do you know how to do a white balance?

Meanwhile you can be tempted on using long exposures, I wouldn't recommend that to you in such a case. As anyhow they're free/shots just do your best

The problem with using any flash near a camera is that the background will probably go dark, then you loose the look of the bar.

Another way might be use a tripod and slow shutter speeds, place the subjects in pools of existing light and use reflectors or bounce cards to let you sculpt the lit on the subject using the bounced light. Fill in the eye sockets with light and try for some rim light to separate the person from the dark background. Have fun.

If you are doing this with people in the bar then you are going to be out of luck really unless it is a pretty well lit bar and you crank up the iso.

If this is just interior shots with no people then grab the tripod, put some of the bars lights on then use 3 or 4 bracketed exposures and combine in photoshop.

last time I did this exposures ranged from about 2 to 15 seconds.

Low power pop flash, 1/8, 800 and try to hold a 1/30th. If that's too bright, stop up to a 1/60th or 1/25th. If it's too dark, push the ISO.