if u intend to self mix your water, do it before hand after letting the water run for awhile.... if i add sand then water then salt, the salt will sink to the bottom of your tank and be part of the DSB so premix the water then fill up the tank then add sand or add the sand before water up to u... either way, the water will become cloudy.... u can add ur lr anytime u wish but it will be better if u add them all at 1 shot and not build it up slowly.. once ur tank is cycled and u add in more LR, it will create a new mini-cycle (like what i've always experienced) the die offs from the lr does help but if u wanna have a faster cycle, add a market prawn into the tank..
hope this helps!