New To Azeroth
as for guilds, if you're not a guild you'll probably receive a lot of invitations to join guilds. If you don't, you can use the guild finder (press J to access it I think) to look for guilds.
I recommend joining a guild that's a high level (maximum level a guild can be is 25. it seems like guilds can level very fast though, a guild invited me that was level 19 a few days ago, and it's already level 25)
The higher the level of the guild you are in, the more benefits you get, like moving faster (faster mount speed, faster ghost speed), more experience and reputation, and other useful things.
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