Moon Guard is a great place to poke your head in at. We have a few resources you can use for a high level overview, and we have a Guild Expo thats been getting a bit more traction over time:
There are a few other posts that we are working on getting repinned as well, however one thing that will help is a bit more info on what you are looking for in a guild as we have a variety between Horde Loyal and Neutral guilds out there. Is your character looking for something more Military? Or perhaps Trade/Goblin oriented? Horde loyal? Neutral? (Game restrictions are a pain for Neutrals but we make it work well.)