I am building a custom shower in bathroom that I've recently gutted. I have not put of backer board yet, so I have full access to do whatever I need. My plan is to run a rain shower head from the ceiling and have a handheld mounted on the wall. I want to use only one at a time; I won't have any reason to run both simultaneously. My issue right now is that I don't completely understand what parts I need to accomplish this. Can I purchase a shower set and a handheld separately? Then I also need a 2 way diverter? I hope my question is clear.