If you are comfortable blogging and writing for yourself, and you have a thick enough skin to consider putting your work forward, the next step I'd recommend is writing an article. If you aren't blogging, I'd recommend that you start there, get comfortable with writing and expressing yourself and get practice. Writing is a skill like anything else and practice makes it better.
Many online publishers are constantly looking for content and often entertain short pieces from new authors. In the technical world, there is no shortage of sites that cater to your particular specialty. In other fields, there are likely just as many choices.
In trying to structure an article, the first thing to keep in mind is that when you move away from a blog-type structure to an article is that now you are definitely trying to teach your readers something. The premise in writing your article must be that you are conveying information, teaching a subject at some level.
I have more detailed post coming with specific advice for technical articles in the next few weeks.