
Originally Posted by
Urthdigger
Feel free to use the airship constantly. It takes you between the three starting cities of Limsa Lominsa, Ul'dah, and Gridania. All three cities have the same features, as far as levelling goes: They all have new camps every 10 levels (with 2 camps for each range starting at 30), guildleves you can accept, quests to do, and guilds for accepting quests.
As far as quests go, it's not a clear "every X levels". I believe by the time you hit 20, you'll be able to do four quests in the main storyline. Speaking of quests however, at level 20 you'll be able to do a guild quest at your guild for xp and lore. You get another at 30, and a final one at 36. This is for EVERY class, even disciplines of land and hand. For disciplines of War and Magic only, however, they also are able to quests to unlock jobs at 30, with new quests every 5 levels to unlock new abilities, and the last 2 supplying you with a full set of artifact armor.