So, there's good news: WoW still runs on an engine that's 12 years old, and therefore any midspec modern build will easily exceed 60fps on ultra settings!
PCPartPicker part list / Price breakdown by merchant
So, in explanation of each part:
CPU: The i5-6500 is the best value of Intel's current offerings. You mentioned that you don't know what overclocking is, so I assume it won't be relevant to you. FYI, it's running the CPU at a higher speed than it comes from the factory, and to do it you need a K-series processor and a Z170 board. But for you, playing WoW, it's not necessary at all. The stock cooler is fine, too.
Mobo: The B stands for Business, so this is a more professional offering than the H110 chipset, but is inferior to the H170, making it a good price:performance match for the 6500.
RAM: The mobo only has 2 RAM slots, so this is to give you enough RAM, while also providing space for a future upgrade if you feel you need one. I don't think you will, though.
Storage: This is something you can tailor to your own needs, but this is how I'd do it. You'll install Windows and your most important stuff on your SSD (for <10 second boots!), and anything that doesn't need to load fast to your HDD.
Graphics: The 470 is one of AMD's newest offerings, and is pretty good value for money. Ordinarily I would suggest the 480, but WoW isn't very GPU taxing, so the 470 is definitely enough, and I've put the $50 saving into the processor.
Case: This is a good case, my fiance has one and it's easy to manage. Though, I like my computers plain-Jane, so if you want something flashy you may want to swap it for another mid tower.
PSU: This isn't the cheapest option, but your PSU is the only part of the computer capable of destroying everything else, so skimping is unwise.
OS: What a law-abiding citizen you are.
Monitor: Dell's IPS Ultrasharp monitors look absolutely stunning, and MMO players don't need the response time of FPS gamers, for example. Your characters will thank you.
Keyboard/Mouse: I've just chosen cheap ones here, because these things are very individual and you'd be best choosing your own for your needs. I've presumed you're not into mechanical keyboards, though my own setup is that very mouse coupled with a Ducky Zero with blue switches, which is perfect for me. I'm sure you have some idea of what you want, but if you don't, feel free to ask. (:
Okay, that's done! Now, onto the build itself: it's not difficult, I promise. It's much easier than it looks and will feel when you first see the plethora of screws that come with your case. Here's a great guide that explains things clearly. You'll have lots of room in your case, so if you want to make it neat and pretty, /r/cablemanagement can help you.
If you have any questions, please ask -- otherwise, all the very best of luck!