Do your research, with a note pad. Read articles on the topic you want to address. Jot down what other people get right, and what they get wrong. Get a good selection of ideas and responses.
If the topic is something you are already well familiar with, skip to the next step.
Make A List.
Write a list of details you want to be sure to cover in your article. Add notes to each item so you have a sense of what you want to do.
Create An Outline.
Use your list to create an outline for your post. Pay particular attention to the flow of the post, an how you'll verbally walk readers through your thoughts.
Think about it this way: imagine your article is like a tour of a building, and you want to walk them through the building in a way that highlights the features and history while engaging them in a great story. Bear this in mind as you write your outline; how do you want them to start with your story, and how you want them to end.
Write Your First Draft.
Write your shitty first draft. This means you just WRITE based on your outline. Don't make corrections, don't edit while writing, just get your thoughts down.
Do nothing. Let the post "cook." If you can leave it for a full day, that's ideal. If not, at least an hour or so. This will help you view the post with fresh eyes when it's time to edit.
Go in and read through the post. Right away you should see obvious spots you need to tighten and other areas that need more explanation.
Use Editing Tools.
Once your edits are done, copy your text and paste it into your favorite editing tool. I love the web app calling hemingwayapp.com. This app is ideal for capturing long and complicated sentences. You can use the app to create simpler, more direct language that is sharp and clear.
Ask Someone To Review.
If you have a trusted friend or mentor, ask someone to give the post a read and offer any suggestions. If you don't have time or a good source, at least read the post out loud to yourself. You'll often catch small tense errors or larger flow problems this way.
Go through the post with your last, fine toothed editing comb.
And you're done.