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Waterfalls and the sea......... yes, though to get those really flat seas and milky waterfalls you may need both the ND2 and ND4 at the same time - basically giving you a 'loss' of six stops to your 'normal' EV. You'll also need a small aperture, like f/22. e.g. if you're getting a meter reading of 1/8th at f/22 without filter, the two ND filters will force you to use a shutter speed of six stops slower - 4 full seconds. Plenty of flexibility to make the milky waterfall but still not enough to give the really flat, white sea. That's why the people who make those shots tend to choose later parts of the day, when it's overcast or even getting past sunset....... they're looking for about 30 seconds and they're the ones that really need the 10-stop ND filters. For most people, the 2-stop and 4-stop filters are fine. By the way, some camera meters really don't handle the huge loss of light through the lens very well - and in that case a shutter speed has to be calculated and manually set. Long shutter speeds can also cause extra digital noise as the sensor can get a little over-active.
The Grad filters are a different case......... they are used to darken areas of a shot that would otherwise over-expose or lose detail in the highlights.
The Kood set should be a good starting point for you.
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