Anyway, how would I start? This isn’t for everyone but it’s the sort of things I suggest to the kids.
the suggestion of getting a raspberry pi is very good, because you have a machine running Linux (the operating system of choice for most serious software development deployments) from the get go. You can always install Linux on a more powerful machine - or use a mac as the operating system it a BSD/Unix variant underneath as you get more adept. But you can use a windows machine too.
then come up with silly little projects:
Write a small python program to convert Celsius to Fahrenheit, based on user input.
write something that manages your photo library, by finding duplicates
write a program that manages your household expenditure on some way
write a program that downloads share price data, and does something like creates a diverse equity portfolio that rebalances itself.
write a bigger python program to do something silly like download a YouTube video, and covert it to an mp3. To do this, you’ll need to ‘glue together’ various other programs, libraries etc.
just scratch your own itches.