Once you are done the main story line grab the relic quest from the NPC outside waking sands.

1) Beat Darkhold, I think Aurum Vale also works, to unlock Admpor keep.
2) Do A.Keep to get Item Level 60 gear and both kinds of endgame currency. (you will do this a whole lot every week... you need a ton of currency to get darklight, af2, and such) You can do Meridianum once you cap mythology for the week, if everyone knows what to do you get more darklite currency per min spent here if you can clear it in around 37-40mins.
3) Once you get some gear you can start on the relic quest this will literally walk you through the intro endgame content until you get to bahamuts lab.
4) Once you have near full darklite and a relic weapon you can start Baha. Lab

Garuda and Titan are where endgame starts in my opinion... that is where the handholding stops more or less, they will kill everyone if you have 1 person messing up.