OH you should have that even before the fish goes in .
You will need roughly 18-20 LBS of CURED LR
and about 10-12 LBS LS
and add it slowly this is the base of your biological filtration ..
Nanoreefing.Com :: View topic - understanding the nano-tank system
Perhaps think about a 10 gallon tote bin for QT while you properly add LR
and cycle your tank...all you would need for QT is filter , and a heater no lights are needed ,
You can take out all your water in your tank and hold it in the bin with the fish the other 6-7 gallons that will be left hold on to , get your live rock and live sand and add it placing your water back into your tank with it guided over your LR
so that you dont have a sand storm
Next get a test kit for salt water , you will want the basics
a refracometer must have one power head for keeping ditrus suspended in the colmn and helping to airate your system
Aquarium pharm test kits for salt are pretty easy to use and good too.
You will need to cycle your tank and with cured rock it may only take a few weeks to do