1. Start taking interest in mathematics and explore Boolean Algebra.
2. Take entry level courses for very simple software languages e.g., Java, .Net, Visual Basic, etc.
3. Join hands with some hobby clubs utilizing software for their projects
When you are comfortable, practice your language. Join clubs, competitions, or simply do online coding challenges (there are many options available). And don't stop there - continue by learning the structure around many computer science careers. Introducing yourself to things like project life cycle will show you just how many different computer science roles will interact with each other.
Best of luck!
Honestly there are a lot of ways to start down the path. I would recommend finding some computer science related games/problems to try and solve. There are entry-level ones for people of all ages which can help teach the basics or explore the computer science way of thinking in a fun way. These really helped me to develop a passion for it. I would also recommend trying out some basic tutorials around the simpler/more popular languages. (Java, Python, etc.) The popularity really helps when you get stuck. For example, if you don't know how to do something in Python you will find multiple posts online about how to accomplish this thing and the descriptions tend to be very detailed.
Hope this helps!