than do u need flash. or just use iso and exposure?
1st step:
Set your camera on a sturdy tripod.
2nd step:
Set to Aperture Priority - might be denoted by 'A' in your mode dial.
3rd step:
Set your aperture to... say around f8
4th step:
Set your ISO value to around 200, best is 100 (that is... if your camera support it).
5th step:
Switch off your image stabilizing system
6th step:
Take your photo.
7th step:
Preview it... if found too dark, then step up your EV then take photo again.
There this is the steps that I normally do when shooting night landscape.