The more you write, the better you get, and the more you learn about what sells. Publishing a blog as a casual writer may bring you followers, but are they the same people who would pay to read you? You could offer a few pay-to-read articles on your otherwise free blog just to test the waters on that. It takes much more effort to recruit new customers than to keep existing ones. If you don't get any bites, it is time to find out whether it is your writing, your topics or the audience you're already performing in front of that is posing the problem.
While you're practising and getting better, it is wise to find yourself an editor or proofreader. EVERYBODY makes mistakes, and not always the easy ones you typically think of when you bring to mind sloppy writing. I can remember countless times putting something before the public eye only to go back later to read it and see glaring errors that slipped by eyes that had already over-read the article.
Finally, getting into the habit of writing as much as possible will allow you to find your groove. Some people write best and most productively in the morning. Others burn the midnight oil. You can force a routine, but often, you'll find yourself naturally if you give yourself a lot of opportunity and flexibility at the beginning. Writing professionally is not the same as writing solely for fun. You want to keep the element of fun there, but output needs to be considerably better and greater.
If you're transitioning, as I am, I know what you're going through ;)