I know how to run scripts and do small changes, but I cant write a code from scratch. I understand this is base on Java, but I dont know if taking a Java course in Codecademy will be enough. I need Dev orientation.
I found some helpful information here https://developers.google.com/adwords/scripts/
It looks like a basic understanding of JavaScript is sufficient to write your own script. There's a 17 minute video on that page that gives a good introduction to deploying a custom script. Best of luck!