The plan is to see if I can salvage my live rock. If yes I am found to fill up the tank with new salt water and just live rock no sand bed. As far as future live stock. I really just want a pair of clowns. Another kole eye tang. Six line wrasse. Acans, torches, bubble, Zoas and some frog spawn coral. Not all at once of course. That is the plan for now.
Great.... yes you can use your rock unless it has known pest on it (like too many palies, etc.)
I will discourage the use if the old sand. The rocks will seed the system.
If you are not planing a full SPS tank, you do not need to go bare bottom. But it is up to you.
So...New sand (or no sand) plus your rocks and it will cycle fast. Then start to populate it slowly.
Reef Crystal is a nice salt to do water. You have your RODI. Basically you have it all.