set up process:
first choose one of the emulators:
after downloading the emulator of your choosing you need to install it
setting up miitomo:
log into google play with your google account
if not when use one of the sites below:
after downloading the apk on your pc you should install the app (should be 2.4.0 version) on the emulator of your choosing with special option of 'apk installation' somewhere there
after that, download and install the same way kaeru patcher
use this guide
do what it tells you
you should be good
if not - check out these lists