Pre-lighten your hair means a bleach with a very or fairly high volume of peroxide. You're going to want to apply that to the areas where you want to be silver.
There are several silver hair dyes available on the market, but they are sometimes difficult to find. Try going to an oriental market in the area, as silver is a popular color choice, or try a beauty supply store.
The dark your hair color is; the lighter the shade would have to be. Then you would have to lift you hair to a blond shade; next you would apply the rinse or a permanent color of silver to your hair.