Choose either python or javascript. Python is nice to work with, javascript is easy to observe in the browser. Both languages are useful and rich.

Whatever you choose, find some tutorials online and start. At least for python, I usually recommend "Automate the Boring Stuff with Python" or "Learn Python the Hard Way", however, you can find many more.

The two other things you will need are a code editor and some understanding of the command line. VS code is a good editor, though notepad++ might be okay as well, because it has less features and would be easy to begin with. The command line is a different than the usual way to rund programs, but it is not all that difficult for the basic stuff you will need on the start.

Good luck and never be ashamed to ask questions.