I used 15 pounds of crushed coral and 15 pounds of argonite sand for my substrate. I also have 40 pounds of Live Rock, in which I put 22 pounds two days after setting up the tank, and another 18 pounds about a week later. I also used 2 damsels to help cycle. You are going to need something to help build up the bacteria such as damsels or a piece of shrimp. I would recommend using the shrimp, because it's a pain in the arss to get the damsels out (I had to take everything out of the tank and it took about 2 hours). I heard using a piece of shimp from the grocery store works well. Your cycle will be done when ammonia, nitrite, and nitrate are all down.
I would really recommend using cured live rock and some shrimp or damsels to help your cycle (also, DO NOT do any water changes while it's cycling).
That's my advice, take it as it is, since I've only been doing saltwater for about a month and a half now.
Good Luck and welcome to the board