Creating the Ads (Banner)
Manually Create a new Application in Admob
^Choose add app manually. After you publish your app to the Google Play Store, you should do this process again for that specific app by choosing the first option here. But for now just continue manually.
Create a banner ad and an interstitial
^Fill out the fields as you want. I did it like so. You go through the same process for banners and interstitial. Interstitial are full screen ads.