Difficulty wise, IMO:

Stronghold coffer farming
Ifrit
Darkhold
Moogle
Cutter's Cry / Aurum Vale
Hamlet Defense
Garuda


Forgot to add something: Beat Dzemael Darkhold at least once before everything else - you need to do it to access CC / AV and get the AF gear in there.

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Easiest end game content both to beat and to find parties is gonna be Ifrit, and he drops very good weapons. Start from there.

After that, you might want to try getting into Dzemael Darkhold parties just to get acquainted with how instanced dungeons work in FFXIV. However, do NOT farm DD gear, as they're all subpar. Beat it a few times, then move on.

Once you have an Ifrit weapon and AF gear, you're more or less good to start doing CC and AV, and some pieces of Darklight gear are very useful (tho the mage pieces suck, so you might not want to focus too much on them if you don't plan to level melee jobs). You might want to try them a bit, while working on getting dual melded gear to substitute some of the weaker AF pieces *cof, cof, BLM hat, cof cof*. A few moogle runs won't really hurt as well.

Start working on company seals. Even if you do not particularly want any of the gear, you should try to at least reach the maximum company rank - this will ensure that you will be able to do every 7th umbral era quest, and continue the questline once the next patch hits. If you don't have the time to do anything else, focus on this.

After this, it's really your call. Some of the stronghold gear is very good, but pretty annoying to farm. A few company pieces can be pretty useful as well. I would recommend trying to level at least one craft. For some gear slots and builds, Double / Triple melded gear can be considerably better than everything else, so you might want to try getting money for those.

Hamlet Defense and Garuda also give good rewards, but you pretty much need an endgame linkshell to have a shot at getting parties for those on reasonable time, as there's not many PUGs going on for those and they're pretty hard without a coordinated team.

TL;DR: Acquire AF, do Ifrit, acquire seals, run CC/AV, get monies for materia, have fun.