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I take it you want to get the blurry 'milky' effect of the water. If so, you'll want an exposure of at least a second (depends on fast the water's flowing). So, you've got to reduced the amount light that goes into the camera to allow a long exposure.
1. I take it you have a tripod. You'll need a stable base for your camera.
2. Certainly start off by choosing your lowest possible ISO.
3. Use a small aperture - not the smallest, but something short of that, probably f/16.
4. Set your camera up in either Av or Manual and frame your shot.
5. See what exposure your camera's meter is telling you to use.
6. Calculate how many stops more you need with the shutter speed to give you your required 1 second. e.g. Let's say your camera, at ISO100 and f/16, is giving you 1/30th of a second..... to get to 1second you'd need five 'stops' of light reduction. (1/15th, 1/8th, 1/4th, 1/2, 1). So you're going to need to put filters on the lens to reduce the light even more...... a Polarising Filter may well give you one or two 'stops' but after that you'll need Neutral Density filters..... they come in different strengths, measured in terms of 'stops' of reduction (although some - a little more expensive - are 'variable' up to 10 stops).
ND Filters are a story on their own and perhaps you can google for the details.
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