Ok, a few thoughts;
- Check your quest log. At the top should be a section for war campaign, and it may tell you to finish a specific quest, or reach a specific level to continue. I recommend following the WC as much as possible while levelling, since you will pretty much need to get it out of the way eventually.
- If you don’t have anything in your quest log, go back to your ship and mission table. Someone there probably has an ! and wants to put you back on the war campaign.
- If there’s really truly nothing, head to the top of the pink pyramid where Princess Talanji is standing by a map table. You should be able to pick a zone and get a starter quest to go there.
But also… as someone above asked, what are your expectations? What do you want to get out of this game? Are you looking to run through the lore, the quests, the backstory? Are you looking for a social game? Do you want to get into dungeon groups, and start pushing more difficult levels of content? Do you want to jump into battlegrounds and arena and fight other players? Knowing your goals will help others advise you, since there isn’t specifically a “you should do this” endgame in WoW; it’s about what you choose to make your focus.
Regarding the social side, it does sound like you’ve had a poor experience with guilds. My advice there is; don’t give up. There are a lot of friendly and sociable players around, sometimes it just takes a while to find them. I’d recommend looking up the Zen Horde community - communities are a bit like guilds, but not tied to a realm, and you can join more than one.
There’s also the community recruitment forum, where you might find some folks who are more dedicated to helping newer players find their feet.