Writing a blog can be about as easy as breathing. If you are writing about a subject that you are both passionate and knowledgeable about the writing is merely getting the knowledge out of your head and sent into the blogosphere Powerline Blog. That sound pretty simple, and it really can be. But you should think about a few things as you are writing.
First, what are you trying to accomplish with your blog? This should be covered in your “about” section. This is a great exercise to help you to define yourself for the audience, but also for you. Lots of people start blogs and soon run out of things to say about a subject or (worse yet) switch subjects and topics seemingly at random and then any target audience is done with you. If you want to write a personal blog – an online diary – that is a whole different animal, but those blogs, unless written by a celebrity, rarely get traffic or make much money.
Second, think specifically about your audience. Why are they visiting your blog and what do they hope to get out of it? Are they coming to learn about a specific skill set (for example, painting with oil based paint) or are they coming to get news about the latest trend in decorating? One type of blog is teaching-based, the other is reporting. Either one is fine and you can mix styles a bit, as long as you generally stick to the same basic subject matter.