Interface
In general there are a few must have addons for a Balance Druid's UI. Weakauras and Plater are two of the ones I recommend most. Also, having Elvui or Shadowed Unit Frames for your frames is a huge advantage as they have a lot more customizability compared to the default blizzard frames.
Macros
Force of Nature Cursor
This macro lets you cast Force of Nature at the position of your cursor.
#showtooltip
/cast [@cursor] Force of Nature
Innervate Target Macro
This macro lets you cast innervate on a specific target, so you don't need to manually target them or have to hover your mouse over the target to cast.
I would recommend using this and a mouseover macro. Replace Name with the healer's name.
/cast [@Name] innervate
Innervate Mouseover
This macro lets you cast Innervate on your mouseover target.
#showtooltip Innervate
/cast [@mouseover,exists] innervate
Remove Corruption Mouseover
This macro lets you cast Remove Corruption on your mouseover target. If the target character is dead it will cast Remove Corruption on your current target.
#showtooltip Remove Corruption
/cast [target=mouseover,help,nodead][target=target] Remove Corruption
Rebirth Mouseover
This macro lets you cast Rebirth on your mouseover target.
#showtooltip Rebirth
/cast [@mouseover,help]Rebirth;Rebirth
Weakauras
Innervate whisper aura: https://wago.io/EkN0SJvYW
For more general Balance Druid WeakAuras you can find a wide range at https://wago.io/dragonflight-weakauras/classes/druid/balance