Starting a book feels hard because the first sentence is doing a job it cannot do. You are asking it to prove the whole book is possible.
It cannot. What actually gets a book started is a short set of decisions made before you draft, so that opening the file stops being a referendum on the project and becomes a task with a known next step.
Five decisions. Then a first week.
The five decisions
Make these in an hour. Write them somewhere you will see them again.
What is it about, in one sentence. A who, a want, and an obstacle. "A retired smuggler has to run one more job to pay for her brother's surgery, and the client is the man who put him in hospital." If yours needs an "and then" to make sense, it is two ideas competing.
Fiction or nonfiction, and which genre. This decides length, structure expectations, and what your reader has already read. Vagueness here produces books that fit nowhere.
How long. Pick a target from your genre's normal range and treat it as the finish line. Most adult fiction lands between 70,000 and 90,000 words, and the novel word count targets differ enough by genre that guessing is a mistake.
Whose head we are in. Point of view is the hardest thing to change after 30,000 words, so decide it now. Third person limited past tense is the safe default and nobody has ever been penalised for it.
When you write. A specific recurring slot with a real time. Not "mornings", but 6:30 to 7:15. This is the decision that determines whether the book happens.
Notice four are about the book and one is about your calendar. The calendar one carries more weight than the other four combined.
Your first week
Do not start at chapter one. Start with the two documents that make chapter one writeable.
Day one and two: the ending, as a note. A paragraph describing how it ends and who the protagonist has become. It will be wrong. Its job is to give every later scene something to steer toward, and books without one stall in the middle for exactly that reason.
Day three and four: a chapter list. One line per chapter, twenty to thirty lines, each saying what changes rather than what happens. If you want a fuller framework, how to outline a book covers five methods and a copyable template.
Day five onward: draft chapter one, badly. Not the best version. A version. You will rewrite it after the draft is done, because first chapters are almost always written before you know what the book is.
Write the wrong words on purpose
The instinct to make chapter one good before moving on is the single most reliable way to never reach chapter twelve.
Leave brackets. [name her later], [check how bail works], [better transition]. Then keep going.
Every hour polishing chapter two is an hour improving something you might cut once you learn what the book is actually about.
Your characters will be flat in draft one. That is expected and not a thing to fix yet, since dimension comes from revision, and character development exercises after a complete draft do more than weeks of pre-planning biography ever will.
The four ways people fail to start
Worth naming, because the fix differs for each and using the wrong one wastes months.
Waiting to feel ready. Readiness is a result of having started, not a prerequisite, so this one never resolves on its own. The fix is a scheduled slot rather than a mood.
Researching instead of writing. Research is comfortable because it cannot fail and it produces the feeling of progress without any risk of a bad sentence. Cap it. Write [check this] and keep going.
Restarting chapter one forever. Some writers have eleven versions of an opening and no chapter four. First chapters are almost always wrong until the book is finished, because you do not yet know what it is introducing. Write it badly, move on, rewrite it last.
Choosing between three ideas indefinitely. Pick the one you can state in a sentence without trailing off. The others do not disappear, and the ability to finish transfers between projects while the deliberation does not.
Week three is the real test
Week one is easy because it is new. Week three is when the novelty is gone and the ending is still far away, and this is where most books quietly stop.
The failure does not announce itself. You skip a session for a legitimate reason, then skip another, then the file gets harder to open because opening it means confronting how long since you last did. Two weeks later it is a thing you used to be doing.
The countermeasure is a weekly target rather than a daily streak. Daily streaks break permanently the first time life interrupts. A weekly target of 1,500 words absorbs a lost Tuesday without the project becoming a failure you are avoiding.
And then the harder wall
Past halfway there is a second, worse version of week three. The draft is too big to hold in your head, too unfinished to judge, and a voice shows up with a genuinely persuasive case that this is derivative and you should start something better.
It arrives on schedule for nearly everyone, which is the useful thing to know about it. It is a stage of the process, not new information about your talent.
That stretch is what Go the Distance is built around. It moves a writer from finishing short pieces to a complete first draft at book length, organised around the collapse points rather than around craft lessons, with material waiting at the halfway wall and at the restart after you have already stopped.
Being straight about fit: if you have never finished a short story, start with shorts. If you finish novels reliably already, skip it.
Today
One sentence for the premise, said out loud.
The ending, as a paragraph, allowed to be wrong.
The writing slot, in your calendar, as a recurring event.
Then 500 words tomorrow in that slot. Starting a book is mostly a matter of having made these decisions in advance so that tomorrow you only have to write.
What should I write first when starting a book?
The ending, as a note to yourself, before any prose. It gives the draft a destination, and a destination is what prevents the aimless middle that kills unplanned books. Chapter one comes after you have that plus a rough chapter list.
How do I start writing a book if I have no experience?
Exactly the same way, since the sequence does not change with experience. What being new actually costs you is calibration, not skill, so the practical move is a weekly word target and a decision to leave early chapters bad until the draft is complete.
Should I write every day?
A weekly target survives real life better than a daily streak. Daily goals work well until the first interruption, at which point the broken streak often takes the project with it. Aim for a weekly number and let individual days vary.
How long before I should show anyone?
After a complete first draft, not before. Feedback on three chapters tends to send writers back to revise those chapters instead of finishing, and early praise or criticism both distort a book that does not exist yet.
What if I lose interest halfway through?
Expect it, because it happens to nearly everyone at roughly the same point. Loss of interest at the midpoint is a normal stage rather than a verdict on the idea, and the standard fix is to keep hitting a modest weekly target while the enthusiasm is absent.