I recommend you to go through this  article which really helps me/you to learn very basics of shooting waterfalls and the inclusion of settings for various scenes is a great and valuable addition.
Moral of the story as follows,
Usage of each equipment
- Tripod -It will allow you to compose your scene very precisely and give you the flexibility you need if you decide to shoot long exposures
- Circular polarizing filter – This is an essential piece of equipment when photographing water to allow you to remove reflections and glare from the water’s surface.
- Natural density (ND) filter – If you decide to shoot a long exposure and it happens to be the middle of the day when there is a lot of light, you will need this gray-tinted piece of glass placed in front of your lens. It blocks some of the light from hitting your sensor, allowing you to use a slower shutter speed. These are sold in varying strengths, and can be stacked for different levels of light absorption.
- Lens cloth – Useful for cleaning water spray off of your lens or filter.
- When you arrive at any scene, the first thing to ask yourself is, “What makes this place unique?”. Pay special attention to that quality.
- Bracket your shots to make sure you get the best possible exposure – this means taking several pictures using different apertures and shutter speeds, and also making several different images using the camera’s exposure compensation (+/-) to brighten or darken each shot to a different degree. See your camera’s manual for specific instructions on how to use these features.
- Shoot in the uncompressed RAW format to allow for more flexible fine tuning in post processing. RAW images must be processed with a compatible photo editing program, or software that was included with your camera.
- Experiment – most of all, don’t get stuck making the same type of photograph all the time. Try to make a long exposure, a fast exposure, some detail shots, and try different perspectives so you come home with a variety of images from your photo shoot.
- tripods – link to some of the best, and most popular brands
- neutral density filters – make sure to get the right filter size for your lens, or biggest one and a step down ring to your smaller ones
- lens cleaning cloth
Keep Shooting 🙂