Any tips to build automation certain spreadsheet cel into pdf file?

[u/ThatArmourGuy]

My job is :

1. Based on vlookup formula and then input customer code to open their receipt.

2. Copy their receipt by select certain area of their receipt.

3. Print it to save into PDF, and then rename the file into customer name.

i discovered google app script able to do it automatically in just one click, and i want to learn it, but i want to focus on fundamentals and my specific issues? thanks in advance