Hey - completely new to android and mobile development…
I went through all the steps as far as I can tell in getting ads to work - but I still can’t see them - since the game is in Alpha…is there a way to test that if it is in alpha?
So I just throw this into the Ad Mob Unit ID?
Yes those are test ID’s from Google so nothing can happen during testing (false clicks etc)
Thank you so much - I didn’t find this before - thanks for pointing me in the right direction! 
Ad format Sample ad unit ID
Banner ca-app-pub-3940256099942544/6300978111
Interstitial ca-app-pub-3940256099942544/1033173712
Rewarded Video ca-app-pub-3940256099942544/5224354917
Native Advanced ca-app-pub-3940256099942544/2247696110
Native Express (Small template): ca-app-pub-3940256099942544/2793859312
(Large template): ca-app-pub-3940256099942544/2177258514
These are test ads from google you can use them during development
this works only if you uploaded the game to google play right? or i can test this with package for development?