Depending on the material you have chosen the care and maintenance for your new countertops will vary.
Since granite varies so greatly, the care and maintenance will depend on the type that you have selected. In general, the darker the stone, the denser and less porous it will be. Darker stones will have to be sealed anywhere from once a year to once every few years and for lighter stone it is recommended that you seal it once every six months to a year. If the stone absorbs water quickly, the granite should be re-sealed.