Admob 2.1 in Unity. How to ?

Hi, I’m making a small android game and I want to put some ads. I have downloaded the admob 2.1 for unity, register in admob web site but don’t know how to use it. I found some tutorials but there are for the old version of admob. Some one knows some good tutorial for the new version or if possible to explain me how to do it works.

Have you downloaded it from here: GitHub - googleads/googleads-mobile-unity: Official Unity Plugin for the Google Mobile Ads SDK

This library seems to be pretty up to date.