Hi there,
That's so great that you are interested in coding! I am a Cyber Security student at DMU with a strong interest in programming. I will try to give you some suggestions where you can start
Firstly, I will briefly tell you how I got introduced to coding myself. I started with Pascal at school, but in your case, I think it might be python. Python is a nice language to understand basic concepts of programming, such as algorithms and data structures. You can start from reading following
https://www.w3schools.com/python/python_intro.asp. Also, you can watch this
https://www.youtube.com/watch?v=kqtD5dpn9C8.
After you understand basic concepts I mentioned above, you can proceed in diving deeper into aspects of programming. I would suggest getting a basic understanding of what computer science is as a whole. You can watch this video
https://www.youtube.com/watch?v=zOjov-2OZ0E. because you would already have some experience with python, you would be able to relate the concepts discussed to your experience and have better understanding.
After that I would suggest going to Coursera, Udemy or LinkedIn learning and taking one of the programming courses with the best reviews (preferably with a big discount) and proceed from there. They all usually have the same contents - so it doesn't really matter how it goes.
Let me know if that was helpful,
Ilya