Unity Setup

Open your Project in unity editor. Then, goto

Find the Service tab and select it. After the Service tab has been selected, click on the Ads button.

If you see an option to install unity ads, click on it and follow the prompts to install it. If the unity ads version is not the latest, be sure to update to the newest version before trying to install it. The minimum required version of Unity ads is 4.3.0. If some error occurs than do step 4

Change the unity version to 4.2.1, if you can not change the version directly from Package Manager then Close Unity Editor then goto your project Packages Folder and do these changes in files

Click on the dashboard icon

A link will open, now click on get started

Now, select I don’t plan to use Mediation, only Unity Ads

If your app or game is live then add the link here

Click on Finish

Click Ad Unit

Tip : use one ad one time in your game.
Now Add Unity Ad Initializer, and paste Game ID

Unity Rewarded Ad

Unity Interstitial Ad

Unity Banner Ad

Google Admob

Download Latest Google Admob Plugin

https://developers.google.com/admob/unity/quick-start

Import the Plugin
Open Google Admob, Add new App
Fill in the details
In Unity Editor goto Assets -> Google Mobile Ads -> Settings…

And paste the Ads App Id

Add some Ad Unit

In Unity Editor, Add Admob Ad Initializer

Google Admob Rewarded Ad

Google Admob Interstitial Ad

Google Admob Banner Ad

Admob and Unity Ad Combined

Advantage of combined ads is that when you set a priority of an Ad Provider, if the first Ad Provider ad is not loaded it will switch to another Ad Provider during the gameplay.