Nike had it right. Just do it. There needs to be a little more to it as well.
I started to seriously write around 2006. I was going to follow the dream of becoming a writer! Unfortunately I also got caught up in “I write, therefore I am.” I was writing. Sometimes a little, sometimes a lot. But there was no real focus to it. I wrote mostly short stories at the time, and joined Liberty Hall Writers. (A new challenge every week, it’s a great way to get yourself started.) I was getting feedback on my work and really improved my writing during my time there.
I also came to realize that I wanted to focus more on longer fiction. Toward the end of my time there, I was rarely getting a story finished because it would develop into something much longer. I turned my focus toward novel length fiction which was truly my intent all along.
So Just Do It, but with a purpose. Set realistic goals, then do everything you can to reach them. Also when you’re setting short term (daily/weekly) goals, keep in mind how that will move you toward your long term goals. In 2011 I started to keep track of my daily goals and saw my production increase considerably. I was making a real discernible effort to meet my goals. Now I have five novels completed and I’m mid-way through the sixth.
I’ve said it before, and I will probably say it again. Daily goals can keep you moving. Just 100 words a day can see you with a novella in your hand by the end of the year. 300 words a day (roughly one page) can see you with a full blown novel in your hands. Grab one of the free tools (Google Drive, LibreOffice), create a spreadsheet, and keep track of your goals. You’ll see real progress by the end of the year.