First of all, assuming you have developed an app, you can publish an app by going to:
https://play.google.com/apps/publish/
It is 25$ per App.
In order to get payment, you need a google merchant account. Lebanon Bank accounts are not currently eligible for Merchant on Google.
You would need a bank account outside Lebanon.
You can then use your google account as Merchant and publish paid apps. (or Enable in-app payment).