It sounds like you know the basics so I'll jump ahead...
3 things determine the amount of light getting to your film. ISO, Shutter Speed, and Aperture. So if you need to increase the shutter speed to capture a fast moving subject and increase the amount of light hitting the film. You could get a Higher ISO film like 800 asa or open the aperture up (smaller number). If you have an in camera light meter it will tell you what exposure to shoot at. That that with a grain of salt as the meter can be tricked by the bright sand. Based on what camera you are using, set the camera to Program and look through your metre. Note what the Aperture and shutter speed are at. Then change you camera to manual and set you shutter speed to the same as when in Manual. Then set your aperture to one number smaller than in manual. Try changing the Aperture to different settings.
Unfortunately then you have to go get the film developed to find out the results so it's best to log your settings for each shot.
Good Luck
J
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