Keep in mind I'm very new to PC building. I apologize for any stupid questions. I read over the Sidebar and some of the guides but I'm still a bit confused.

What is the difference between Micro ATX and ATX cases? My case is an ATX case, but my motherboard is Micro ATX. The details on my case say that it's compatible with Micro ATX mobos so I'm not too worried, just curious on the details. I'm just trying not to mess up my build by buying parts that don't work together even though PCPartPicker says they're all compatible.

Also, would my build work fine? I don't want to overclock (which is why the CPU I'm getting is locked), so I'm wondering if the stock cooling system would be fine. It's an i5-4460 @ 3.2GHz.

And finally, I'm wondering if the build I want to do needs any extra fans right now, or if I would be fine for a while until I can get extra fans (if I even need them). My case comes included with one fan, I believe.

This is my build: PCPartPicker part list / Price breakdown by merchant