First zone of Heavensward

[Gunspec]

The city Ishgard will be 100% full on day 1 (like Gold Saucer was at 2.51 start). I also think that you have to do first some MSQ in Ishgard before the way to the first Heavensward field zone (Western Coerthas) get unlocked.
I plan to do the MSQ with MNK and BTN at the same time. Doing the fights with MNK, pick up the quest rewards as BTN for the exp. Hmm, or as WVR instead of BTN.

It's been ages since I've leveled anything, but I vaguely remember main storyline quests require you to be disciple of war or magic to turn in quests. Not 100% sure though, might have just been sidequests.

[Felis]

It's been ages since I've leveled anything, but I vaguely remember main storyline quests require you to be disciple of war or magic to turn in quests. Not 100% sure though, might have just been sidequests.

Can turn in the quests with every job you want. But you have to switch to a battle job during the quest if it contains fights.

[Gunspec]

Can turn in the quests with every job you want. But you have to switch to a battle job during the quest if it contains fights.

I remember trying to do this with moogle or hildebrande quests as a fisher, though, and it wouldn't let me. There was a message that said I needed to be war or magic.