Should I have my tank filled with salt water and salinity levels in check before I add the live rock to cycle it? Or can I basically do them at them same time?
Yep, as Mutant says, Water, heat it up first then bring up to the correct SG, you can mix it in the tank, or all your beneficial bacteria will die off and any hitchhikers will also be winging their way to the big tank in the sky if you add the rock before the water is a good temp and salty