Hey,
Welcome!
Most people these days are converting to a dsb. (deep sand bed) It is the common concensus that about a 5" bed is the best. This can be mostly "dead" sand that is then seeded with live sand. Once that is all in and your water clears, put lr (live rock) on top of that. Again, the base of your lr can be 'dead' rock, with nice pieces of lr stacked on top of that. 11/2 to 2 lbs of lr per gallon is a good rule of thumb. It will take a while but eventually all your sand and rock will become live.
Your next major concern should be lighting, but that's another subject!
Be patient, be patient and be more patient. And read, a lot! Use the 'search' feature on top of this screen on specific topics. I'm sure more people will post with more technical answers, but that's not my strong suit!
Take care, and good luck with your new reef!
Dan'l