Bettas are like potato chips....you can't have just one.
You had asked if there was anything you needed - sounds like the basics are covered. A heater, tank, water conditioner, and food are the basics. A hidey cave and plants (silk or real) are icing.
I got a betta for each of my kids - they each have a 2.5 gallon tank in their room. My sig indicates how that worked out.
Make sure you get StressCoat+ if you plan to use it as water conditioner, they do sell a "standalone" version that's just for slime coats.
Happy habitat hunting!