Rock and sand vs. LR
"Live" in this sense means having the beneficial nitrifying bacteria that converts ammonia to nitrItes to nitrAtes. So sand and rock will become "live" once the cycle completes.
So, if you go to your grocery store and get 2 raw, unseasoned jumbo shrimp, dump them into your tank and let them decay, this will start your cycle.
Now you can "seed" your tank using Cured LR
and or a few Lbs of sand from an estabilished tank. This is another alternative to going the shrimp route, assuming you get enought LR
to skip the cycle.