Questions are good, dont feel bad about asking. if you dont know ask, thats what this place is for.
As for if the fish are going to be ok, who knows, damsels are tough but ammonia is deadly.
Cured LR is rock that has no die off and is established. Buying cured rock is effective as long as it isnt shipped, if you carry it home in a bucket of water it is still cured, if it is shipped there will be die off and it will need to be recured, usually the rock available at your LFS is supposed to be cured.
Where you are in your initiation of your cycle phase, if it were me I would take the damsels back to the store and just buy any LR cured or not and cycle my tank that way, that way you dont run the risk of killing animals.