Do use a monopod with cable switch if possible, ISO 800 would be the minimum ISO for those dim situation and use Tv mode to set the lowest possible speed. ISO 800 is preferred for less noise but ISO 1600 is frequently required owing to the low light.
For metering, use CWA mode with some minor +/-ve exposure compensation if needed. Normally, you would not need exposure compensation with the K100D. Don't use the multi-segment metering mode to avoid overexposure and inconsistent exposure from shoot to shoot.
For WB, AWB will be fine which normally will re-produce what you can see (to preserve the atmostsphere).
If you cannot use a monopod, turn on the SR. Otherwise, turn it off.
Well, here is an old example of mine (taken by *ist D):-
Pic Info: F*300/4.5 at f/4.5 and 1/125s, AWB, CWA metering, with monopod, at ISO 800, in-camera Jpeg