There is a lot of Raspberry Pi 3 B cases but you want a case in which you mount Pi-Fan to that. In this case, open up this link:
TOPmountain Raspberry Pi Case Abs Protective Shell Case for Raspberry Pi 3 with Fan Hole(Black)
This case has a fan hole. To configure the Raspberry Pi for automatically turning on the Fan, follow this link:
Automatically Control Your Raspberry Pi Fan (and Temperature) with Python
It shows you how you can mount the Fan on GPIO pinout and configure the pi by some python scripts.
But when I went to install it, I discovered there's nowhere to mount it, nor does there appear to be a place to connect it to the gpio, given the breakout breadboard kit.
Watch these videos:
https://www.youtube.com/watch?v=R6s_7UaOSKA
https://www.youtube.com/watch?v=OJn44OjGJ_w