Hey! So generally after you're done there you've done the first major section of the order hall campaign. After that you'll want to consider looking at other areas of the map and your active quests for where to go next, most of the time this is the Broken Shore, so looking for quests on the map will be your best bet! With the way quests are now, this is often the quickest way to continue as the quest icons on the map are there to let you know if there are unfinished quests, along with the new quest log breaking everything down in to sections :)
In addition, looking at community websites such as wowhead.com for the last quest you completed and checking the comments is a good way to get answers quick too!