End game really comes down to finishing the main storyline - you can't unlock any of the quests, dungeons or raids for endgame until the main questline is complete. Then it just basically boils down to a gear check, which you really don't need to worry about too much at your current level. Really, at this point in time, don't rush to end game - there's so much people miss out on in a effort to get to 50 and when they get there, they've burned themselves out. So just play through the story and level your main class at your own pace.