The first line in any story or article is your hook. Raise a question right away. Once a question is raised in the mind of the reader, he or she will want to keep reading to find the answer--and you have them "hooked."
The first "hook" in a short story usually foreshadows the central problem that will challenge the protagonist. In an article it asks a question on what the article is about. A hook should raise a question in the mind of the reader that will be answered before the story is over. Hooks heighten reader interest, pure and simple.
The good news is, you can write that line last, so don't waste time starting your story -- get the work done and then figure out the first line.