You’ve asked two totally different questions!
Question 1, about establishing a daily routine. Go with what you know. Are you a tech loving kind of person? Then use technology to support your goals, make a digital to-do list or list of things that need to be done during the routine and rely on it. If you’re not a techie, use a good old fashion pen and paper. One great way to keep the routine going is to have a calendar where you put a big red X on the day when you complete your routine, then try and see how long you can keep the X chain going. It’s surprisingly motivational!
Question 2, becoming a writer. This is a rough and tough question to answer. The first step is writing something every day, or every week, or whatever time period you want to do. More writing will generally increase your writing skills. I would suggest getting a blog and writing to it every whatever period you decide. That way you get your words out there, and someone may stumble onto your site and become a fan. I advise you to go with the self-published route instead of the traditional route of submitting manuscripts to publishers, simply because this is the way most media is becoming as time goes on, but do whatever you like to do. Do realize that many many people want to become writers and a very small subset actually become writers full time. But you won’t get anywhere by being lazy and not writing, so get out there and start writing something.