Self-publishing is not always the best option.
Maybe you can start writing for a well established magazine/blog. This may help you to build your 'audience'.
If you want to go on your own, I think the best is first to define what are your goals, from that you can choose if your best option is a blog, a newsletter or a book.
Every platform has its advantages and big disadvantages but choosing one is a matter of your audience's preferred channel to stay in contact with your work.
Self-publishing is not always the best option. Maybe you can start writing for a well established magazine/blog. This may help you to build your 'audience'.
If you want to go on your own, I think the best is first to define what are your goals, from that you can choose if your best option is a blog, a newsletter or a book.
Every platform has its advantages and big disadvantages but choosing one is a matter of your audience's preferred channel to stay in contact with your work.