A Unity ID allows you to buy and/or subscribe to Unity products and services, shop in the Asset Store and participate in the Unity community.
Separate names with a comma.
if changing to jdk 8 don't work, you can also try to download an earlier version of the sdk tool folder...
here's a 5 min video that shows how to import both google play services and admob [MEDIA]
here's a 5 min tutorial on how to import google play services and admob [MEDIA]