Welcome to the club! Glad to see you finally made the jump, you won’t regret it. We went with the same Netflix / Hulu / Sling setup to start, but ultimately dropped Sling for Vue and haven’t looked back, It’s a bit extra $ in the end, but well worth it in IMO.
As for remotes, I bought a few of these to use with our three Fire Tv’s and absolutely love them. Essentially like having one remote, kinda. https://sideclick-remotes.myshopify.com/