Trevor, as always you will get varying information, but here is how I will rig up:
If water is down - ~4 foot of Berkley Vanish Fluorocarbon, 8 lb. Tie a loop on both ends so it is easier to rig and re-rig. I usually place my strike indicator a few inches off of my line on the leader. I have used only 5x tippet because it is the only thing I had and had bought it before I knew to use 6 or 7x. I did run out on my last trip and picked up some 6x. No matter the size, I tie about 18-24" and tie on my first fly. Here I either tie a San Juan, Chamois Worm, Scud or egg pattern. I then tie an additional 12-18" to the bend of the hook on my top fly. For my bottom fly I use a lot of Pheasant Tails and Zebra Midges. I use a small split shot about 4-5" above the top fly. I think this is a key component that many people may forget. It really helps get your rig into the strike zone quicker and keep it there. If the water is up you obviously if the water is up you need to add more leader and tippet, enough to get down to the bottom. I typically will stick with about the same amount of tippet and add additional leader material since its cheaper. I usually throw on two, instead of one, split shot above the top fly and add one above the bottom fly as well.
Hope this helps.