How to become a mobile app developer?

Question

Mobile development

Good afternoon!
There was a desire to try their hand at mobile development.
No programming experience.
Where to begin?
Perhaps there is some well-established plan for studying the material.
Android or iOS?
Who has how long did it take from starting to getting a job?
It is clear that if the pros, then the salary is high, but still - is it a good salary in the labor market?
Thanks in advance for your answers!