Whether an electronic or a print article, the first line should catch the reader's attention. That said, the first thing the writer needs to do is write! Get the words down on paper, then revise till it is done. (see my hub on rewriting https://hubpages.com/literature/rewritinghints ) Once the words are on the page (or in the computer) pick the line that best hooks the reader and start with that line.
When I write DIY stuff, I start with why I started the project or what makes the project unique. Then I describe the project and give directions.