My wife needs a new computer. She mainly plays WoW and Heroes of the Storm, I'd like the computer to last for a few years of playing those games. I assume the build on MMOc's main page will meet those needs. I don't know how to link the parts.
My question is, what else will I need? I have a good mouse, I'm going to buy her a new keyboard, I assume I need to buy Windows, is that it? Will this really just be plug and play? I've never built a new computer I've only replaced parts in old ones.