We are doing a complete remodel on the bathroom. It has been demolished and is ready to be rebuilt. My plan is to run a rain shower head from the ceiling and have a regular shower head mounted on the wall. I want to be able to use them simultaneously, as well as, one at a time. My issue right now is that I don't completely understand what parts I need to accomplish this. I know I can purchase a shower set and the rain head separately, but do I need a specific shower set? What will I need to make this set up happen? I hope what I'm asking is clear.