First time healing question..

[Mhaeric]

White Mage is definitely the easiest to learn, since almost all of its GCD and oGCD abilities are just direct heals or regens. Scholar has several oGCD that modify healing spells, and most of their healing is done through their oGCD limited resource so they take some practice to be most efficient but are great at healing once learned. Astrologian has cards as a significant part of their oGCD abilities making it very busy work to manage it properly.

All 3 healers are viable despite what some people might say. I personally main SCH (along with RDM) so it's my favourite. I do like playing AST though too. I level WHM but don't really play it since it's too boring for me with just its direct heals.