Are there any up-to-date tutorials on integrating AdMob into Unity?

Are there any up-to-date complete tutorials on integrating AdMob into Unity via the Google Play services? I unfortunately can't spare any money at the moment for the paid plugin packages, and the free ones seem to work with an old version of AdMob that isn't suported anymore.

The only tutorials I could find use the old AdMob SDK. As for Google Play services, I can't make head nor tail of their documentation. I've only ever used Unity to make apps/games so I don't understand any of the stuff about Eclipse or .xml files.

I basically have a completed game and need to know how to integrate AdMob from scratch.