Welcome! Glad you joined. my history: started freshwater, transitioned exact same equipment over for my saltwater only fishtanks years ago, and love FOWLR (though...but we have reef (coral AND fish) at the moment). Nice thing with fish only is so many more possible options - butterflies, angels, ... I'd go with a BIG tank and plan for gorgeous fish - you're post has me dreaming.
Fish can be bought any where local, from other hobbyists, and even online. There is Forum to help you find others in Tennessee. Maybe this will help you:
https://www.reef2reef.com/forums/local-reef-club-discussion.516/
Have you considered starting your build thread? I found its a great place to document my tank's evolution for myself. I started tank first then joined, so I'm still finding myself going back collecting pictures & updating historically as well as current state. Once you create your first post in your thread and link it to your account, they will give you build badge (look left, under my ID)
This is a good reference book type online article I still review:
https://www.reef2reef.com/ams/the-supreme-guide-to-setting-up-a-saltwater-reef-aquarium.84/