How do you start your story? What gets in the way of writing it? There are all sorts of chronic problems that derail the creation of the first few pages.
Dithering -- where you don't commit to a Work-in-Progress, so every day is a big decision -- is one of them. Distractions (snack? coffee? chores?), which keep your from sitting down to write or keep taking you away from the page (email? social media?) can stop you before you really start, too.
Then there's the blank page. Accusing you. Taunting you. Daring you. There's an apocryphal tale the Winston Churchill (who wasn't a man associated with fear) needed to have his teacher splat paint on the pure white canvases before he could get going. True or not, I like it. A little bit of mess can lead to wonder and joy.
I've already written about "in which" sentences. (As it happens, I'm reading Neil Gaiman's Seasons of Mists, and each section begins with one of these.) In addition to forcing you to commit to a defined task and prompting your subconscious, you can grab this sentence and use it like an essay topic to launch you into writing. It makes a pretty good pain splat.
And it rescues you from the difficult business of having to develop a perfect hook, a catchy phrase, or an engaging voice. You get time to get your bearings, warm up, and find your rhythm before doing something challenging (and, perhaps, unnatural).
If hooks come, good. If you finish a first draft without any, that is not a problem. It doesn't mean you aren't a writer. It means, like most of us, a lot of what draws the reader in comes in the second or third draft. Or even later. You may even discover that what you've created, after the inevitable trimming of your prose, is a kind of "hook" you would never have considered. One that emerged organically from the storytelling.
Storytelling is always your first job. Even when you are working without an outline. Depending on how you work, the beginning of your composition may begin with an image or a feeling or furious action or a character who won't shut up. Note: This would be the beginning of your storytelling, not he chosen beginning of the work you present to the public.
I only realized recently that I am inhibited at the beginning (though not for the first few sentences) by mechanical considerations that have to do with the final product. What I'm writing might not feel tight enough for a flash fiction story or the scenes may be coming too much one-upon-the-next for the correct pacing of a fiction script. Or it might not have enough jokes per page for a comedy or it might have too much humor for a work that's dark and tragic.
On some level, I think all of these represent a part of me that is trying to get it "right" before I get it down. As if taking care will help me avoid extra drafts. Which is crazy because that kind of thinking hobbles the work and takes the fun out of it. It even insidiously undermines the freshness of the voice. Any impulse to "get it right" during a composition stage kills the flow and tends to approve of cliches. (Cliches are the non-creative mind's way of getting it right from the beginning. They are comforting. They don't raise alarms. They are pleasantly... bland and unoffensive.)
"Requirements" should be gathered ahead of time, reviewed the day before, and ignored in the first draft. There are a lot of "shoulds" for beginnings, regarding setting things up, introducing characters, creating immersive scenes, presenting the story question or the protagonist's desire, informing the reader of the dire consequences of failure, etc., etc. Please make sure all of these are established by page three or four. (It gets worse when marketing provides requirements for alpha males, series tropes, and such.) Talk about inhibiting.
You can't fill out a crossword puzzle and tell a story at the same time. It's okay to hope to get a few of these in as your write the first, second, and third pages (and keep getting more in through the first quarter of the story, when a new set of requirements come due). But don't worry if you don't.
Worry instead about your reader. Leave the rest behind, take on a story you have to tell, and imagine your perfect reader (use one person you actually know if you can) leaning in, nodding, and expressing the emotions you are trying to evoke. This, not the hooks or alpha heroes or immersive descriptions of settings, will get you successfully through the beginning of your story.
Not enough? Still unsteady? Here's one more thing to have in your kit before you begin your composition -- a good ending. If you have a great ending, that's even better, but a good one will inspire a beginning more reliably than anything else I know of.
A great character can get you going with charm and eloquence, but might let you down -- more show than substance. A high concept can generate twists, turns, and must-have scenes, but may not be right for you (being clever, but not essential to who you are) or may not have a satisfying resolution. A world like Tolkien's may create the perfect space for rich evocative stories, but you might get bogged down in narration. But a good ending is a destination that pulls you toward it and keeps you on the journey.
In my experience, a good ending also morphs in the telling of the tale to a better ending. There's no guarantee that it will be the best ending ever, but it is the closest thing to an insurance policy on getting a solid first draft that works as a story.