Hey there! (Sorry to pick on you, I just have way too many things to say and no filter.)
If you’re writing as a hobby, then you don’t need to do anything but write. Writing as a hobby is all about you having fun and sharing what you love. Unless you’re really, really, really lucky, it won’t ever make you more money then any other hobby, but that’s not its purpose. It’s for your own relaxation and enjoyment, and you should always, always treat it as such.
If you’re writing as a career, then it will be a career. It’ll require 40 hours a week (or more) if you want to live off it. It’ll mean you have to do things you don’t want to do and might not enjoy doing, and you’ll have to do them quite a lot. And because it’s a career in which you work from home, it’ll mean you’re always on the clock, always required to motivate yourself, always depending on your own discipline to get you to the next paycheck.
Just because it was once a hobby you had, does not mean it’s not going to be any more relaxing or enjoyable then being an engineer or a doctor or a teacher or any other career path imaginable. You have to choose a writing career because doing anything else makes you actively want to write, and you have to choose it because you’re willing to do the parts of the career you don’t like just so you can also get to do the parts you love.