Excellent questions!!
first - no rock is really "cured" rock, some is jsut better than others. Before I answer this obvious question...
Second - if oyu have an established tank adding more than 5% in weight of live rock to an establihed tank (2.5 lbs piece of uncured LR to a 50 Gallon tank) the tank will recycle. It may only have a slight cycle or it may completely recycle itself, so be ware!!
Back to the first - if your tank has not been cycled, inspect the LR for dying tings and scrape off and just add the LR, turn the lights off and keep the power heads running. watch the ammonia and nitrite levels
ammonia will spike and then nitrite will spike and when both are at zero you'r ready to add some hardy animals. I'd suggest some astrea snails and some hermit crabs. add small amounts of frozen fish food to keep the hermits eating and the tank bacteria developing and after about three weeks add some fish, preferrably somethig like clown fish.