Level up a new job

[h0tNstilettos]

I also forgot to mention FATE parties. I didn't really mention it because unless you can actually form a FATE party, just soloing them and doing nothing else is not very good experience. FATEs are only viable if you're in a party, otherwise dungeons are better. That's why I mentioned only soloing FATEs if one happens to be nearby and actually can be soloed as some can't, and doing for challenge log. There was a time when FATE parties was the go to way to level secondary classes, but after they increased the experience gained from dungeons and the low level dungeon roulette, dungeons became more viable with FATEs done between. But strictly FATEs as sole leveling method is still just as good IF you can get a party.

Not really, other than as you level the amount of dungeons you can queue for increases, as you can go back and level sync down in a lower level dungeon, but you cannot enter a high level dungeon as a low level (as they have minimum level requirements you have be in order to enter).

Also no one seemed to mention it but another option around level 40 is to do the daily beastmen quests - each beast tribe has a clan of friendly beastmen who will give you a quest (up to three) once every 24 hours. At first you can only do one quest for them a day, but as you earn their trust more quest givers in that tribe will unlock and thus the amount of quests you can do each day also increases. These quests have a slightly different quest icon (instead of an exclamation mark, they have a speech bubble with a 'recycle' symbol).

The beast tribe quests are unlocked by a quest given by the commander of each Grand Company once the required level is met.

I knew I was forgetting something in my post. >_< I was trying to figure out what it was, and it was beast tribes. Very good point, but just a couple corrections. You are allowed to do 3 beast tribe quests at first, then after going up a reputation level you can do 6 a day. So you would do the 3 highest and the 3 the next tier below the highest 3. Also, the level to unlock each tribe's questline vary. Level 41 for Kobold. Level 42 for Sylph. Level 43 for Amalj'aa. Level 44 for Sahagin. And level 41 for Ixal. The starting quest for Ixal is level 1, but the pre-requisite quest is level 41. I really don't think beast tribes are worth the time and effort if OP is only interested in leveling to 50 as quick as possible, but they are worth it for other things. I edited my original post to mention beast tribes.

Leaving this link here for the OP:
http://ffxiv.wikia.com/wiki/Beast_Tribe_Quests