Hi Scorcsia,

The main quests can be identified by the bubbles above NPC's heads. These will not look like the most common round (or oval as you wish) bubbles, but rather a edgy, flaming-like looking bubble.
I sat down after the tips I got yesterday and decided to follow only the main quests.

After a good number of these, I was offered the ability to use Airships, and that airship brought me to Limsa.