It all depends on what you're writing and what you're trying to convey. But mastering the art of the "first"--the first sentence, first line, first page, first paragraph--are all important in writing.
That is your lead-in and what's going to hook the reader. If you can't get your reader pas the "first," it's a wrap.
But there are many types of lead-ins: you can use a quote, a statistic, a question, a foreshadow, dialogue, setting or some other device to open up your writing.
This is my writing motto: "Now the rules before you break them!"