Newer player with a few questions.

[Jewka]

I usually tank in wow. But you do make some good points and have me leaning back toward tanking. I was thinking of doing something different here in ffxiv

[Zari]

Tank or healer would be easiest.
That or Bard.

Also note you can play every class in the game on one character once you hit lv 10. Just need to join the guild for that class and equip the weapon. Each class has separate levels