slow shutter speed/ over exposed

[NateWagner]

actually, if he's going for the cotton candy effect, he's going to need the neutral density filter.

He needs to set the aperture to a high f/number his ISO to 100 (or as low as possible). and get the shutter speed down quite low, 10-15 seconds is great. (for the flowing water)

 

[Plato]

Sergeant...

I don't disagree but I believe that the OP needs more photo experience before getting involved with the histogram.

 

[Samanax]

its a nikon D60...

Have you tried shooting in Manual Mode? (page 44 of the user's manual)