Hello! Advice for a newbie healer and new friends?

[Niwashi]

Arcanist wise - what should points be put into when the time comes to need to do that?

Up until level 30, what you want is Intelligence. After that, it depends on which of its jobs you'll be focusing on, since that's the class that can extend to either of two different jobs, Scholar or Summoner. Scholar is a healer, so is best served by Mind. Summoner is a damage dealer who does better with Intelligence. If you're only planning on doing one of those two jobs, put all your Arcanist points into its primary stat. If you're planning on alternating somewhat evenly between both SCH and SMN, I'd start with a half and half split on attribute points. You can get an item from your Grand Company for a few GC seals to reset them if you change your mind and want a different focus later.

If you're only doing Arcanist for the sake of your White Mage job, and don't plan on advancing either Scholar or Summoner beyond that, its highest level cross-class skill that your WHM can use will be Eye for an Eye from ACN level 34. (So, up to level 15 is necessary, whereas up to level 34 is useful. Start with the 15. You can move on the rest of the way to 34 later.) In that case, put your ACN points into Int until 30, then unlock SCH and optionally reallocate them to Mnd for the next few levels.