I'm borrowing the title from Brian Kelley, who wrote a post by the same name. The essence of his post is that you need to start blogging if you want to blog. If you want to make this part of your brand, or part of your career, you just need to start. Don't wait for the perfect ideas, or the perfect formatting or blog software, or anything else. As Nike says....
Just Do It.
I think that's the best advice, and you ought to start. As I wrote last week, you can get started quickly, in 5 minutes, and then go from there.
One last thing I'd say again is to get feedback on your writing early. Maybe privately, maybe by pointing some people at your entries, but get someone to help you learn to write better. Learn to convey your thoughts in a way that is clear to other people. It's not that hard, but there are lots of rookie mistakes that you make early on. Getting feedback will help you fix most of those small errors and allow you to write in a way that is clear to your readers over time.