Step 1. Log in to your AdMob account at https://apps.admob.com.
Step 2. Click Apps in the sidebar
Step 3. click on add your first app
Step 4. Select the platfrom Android or iOS and tick mark the option yes or no if the app supported app store
Step 5. Click on continue button
Step 6. Enter app name
Step 7. Click on Add app button Step 8. When app is successfully added then click on create ad unit
Step 9. Select Banner
Step 10. Enter Ad unit name Step 11 : Click on create ad unit button
Step 12. You should now see your apps 'Ad unit ID' in a format such as 'ca-app-pub-XXXXXXXXXXXXXXXX/XXXXXXXXXX' where 'X' represents integers. Copy and paste that value into the 'AdMob Ad Unit ID' field in your App , after that click on create another ad unit.
Step 13. Select InterstitialStep 14. Enter Ad unit name and click on create ad unit button
Step 15.You should now see your apps 'Ad unit ID' in a format such as 'ca-app-pub-XXXXXXXXXXXXXXXX/XXXXXXXXXX' where 'X' represents integers. Copy and paste that value into the 'AdMob Ad Unit ID' field in your App. And click on Done Step 16. Click on Settings
Step 17. Click on Account InformationStep 18. Here is your Publisher ID.Copy and paste that value into the field in your App and Click Apps in the sidebar