shooting with long exposure

i was wondering what is the best way to set up my t2i for a long exposure shots, i see them on the sight, but curious on how to shoot them, when i play with my camera all i seem to get is a white screen, is to much light getting in and if so how do minimize my light that gets through?
any tips would be greatly appreciated.

Thanks

hi, if you need to use long exposure during the day. Try neutral density filter over the lens. they come -1 to -6 stops

you can bring the f-stop all the way down to the lenses max which will prevent alot of light from entering and forcing you to expose for a longer period of time. dont forget a tripod.