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 the site 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'
on mumu, nox and memu:
after that, download and install the same way kaeru patcher
follow this guide
you should be fine
if not - check out these lists