I also don't have many macros for my White Mage.

If I had to recommend any macros, I'd suggest <tt> (target of target) macros for your attack spells. When you hit 50 on WHM, usually your attacks will be your AoE which doesn't need a target. But having a target of target macro for your single target spells will allow you to hit what the tank is hitting without having to unselect him. Meaning you can heal him quickly if needed.