Tito, first you'll need to cure this stuff - it pisses yellow for a few days when soaked in RO/DI - make sure you cure it a little first and then ad some good live rock from someones system - get good flow and good parameters and it'll be live in no time.
MY sand is dead as well. Will I have to get some sand from an established aquarium as well to get live sand or will some live rock do for both the Marco Rocks and the sand?