How to take clear action photographs using a Nikon D3000 camera?

I currently purchased a Nikon D3000 camera and I have gone through the user's manual and video to figure out the best way to take clear action shots and I have been unsuccessful. I have the 18-55mm and 55-200mm lens but not sure what are the best settings on the camera to help me get the clear pictures I want. The pictures that I am taking are at dusk and at night in a football stadium where my son plays football. I have tried making adjustments but with no luck. I am feeling very frustrated since I am new to using these types of cameras. Any advice would be greatly appreciated!

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