Welcome to the community, friend. Here’s to many great (and hopefully) immersive and fun adventures you’ll have.
I highly recommend swinging by this event since your interest is in Dwarf roleplay, you should get a pretty good idea of the scene then and I’m sure you’ll have a good chance to look at some Dwarf-focused guilds there so you can take your pick.
Dwarf roleplay has in my opinion stayed pretty high quality through Argent Dawn’s quality and lately I’ve seen more and more Dwarf guilds pop up so you’re in luck! But if you’re looking for something else, perhaps adventure guilds that recruit other races too take a look at the forums to see what the latest advertisements are, you should be able to find something that will interest you.
Have fun with that! I definitely recommend doing the “Dwarf zones” questlines to get a better feel for the Dwarves in WoW but I’ll say that Blizzard was inspired a lot by Tolkien’s works when creating them so you’ll feel right at home I think. There’s a lot of cool lore surrounding all the Dwarven clans and they all have a pretty rich history. Enjoy friend.