מחר אני רוצה להסתפר, ולכן קבעתי תור במספרה ליד העבודה.

Because the appointment was made already, even though the haircut itself is in the future.

So the timeline is:

• מחר אני רוצה להסתפר = tomorrow I want to get a haircut
• ולכן קבעתי תור = therefore, I made / scheduled an appointment

This is very natural in Hebrew. English does the same thing:

• Tomorrow I want to get a haircut, so I made an appointment.

The wanting and the haircut relate to tomorrow, but the act of booking the appointment happened earlier.

להסתפר means to get a haircut / to have one’s hair cut.

It comes from the root connected with hair-cutting, but the form here is important:

• לספר = to cut hair / to tell / to count, depending on context and root pronunciation/spelling history
• להסתפר = to get one’s hair cut

In other words, להסתפר is the natural verb when you mean that you are the one receiving the haircut.

So:

• אני רוצה להסתפר = I want to get a haircut

not

• אני רוצה לספר = I want to cut hair / tell / count, which would mean something else entirely

It is an infinitive in the Hitpael binyan.

The structure is:

• רוצה = want
• להסתפר = to get a haircut

After רוצה in Hebrew, you normally use an infinitive:

• אני רוצה לאכול = I want to eat
• אני רוצה ללכת = I want to go
• אני רוצה להסתפר = I want to get a haircut

The Hitpael form often has a reflexive or self-directed sense. Here it gives the idea of doing something to oneself / for oneself, which is why להסתפר means to get one’s hair cut rather than to cut someone else’s hair.

Hebrew often puts time expressions near the beginning for emphasis or clarity.

So:

• מחר אני רוצה להסתפר = Tomorrow I want to get a haircut

This is very natural. Hebrew word order is more flexible than English word order.

You could also say:

• אני רוצה להסתפר מחר

That also works, but starting with מחר highlights the time right away.

ולכן means and therefore / and so / therefore.

It is made of:

• ו־ = and
• לכן = therefore / so

So ולכן connects the two parts of the sentence logically:

• I want to get a haircut tomorrow,
• therefore I made an appointment.

It is perfectly normal Hebrew, though it can sound a little more written or formal than very casual alternatives like:

• אז = so
• אז לכן = so therefore, though this can sound redundant depending on context

In a neat, standard sentence, ולכן is a good choice.

Yes, it is a very common expression.

• לקבוע תור = to make / schedule / set an appointment
• קבעתי תור = I made an appointment

Literally, לקבוע is something like to set or to fix, and תור can mean turn, queue, or appointment, depending on context.

In medical, beauty, and service contexts, תור often means appointment:

• קבעתי תור לרופא = I made a doctor’s appointment
• יש לי תור במספרה = I have an appointment at the hair salon

So this is definitely a phrase worth learning as a chunk: לקבוע תור.

Yes — and that is something that often confuses learners.

תור can mean:

• turn
• queue / line
• appointment

The core idea is something like a scheduled or ordered spot.

Examples:

• אני בתור = I’m in line / it’s my turn, depending on context
• יש לי תור בשתיים = I have an appointment at two
• לקבוע תור = to schedule an appointment

So in this sentence, because it is about a hair salon, תור clearly means appointment.

Because Hebrew uses the preposition ב־ for in / at.

So:

• מספרה = a hair salon / barbershop
• במספרה = in the hair salon / at the hair salon

In context, English would usually translate this as at the hair salon.

The phrase:

• קבעתי תור במספרה

means:

• I made an appointment at the hair salon

not necessarily inside it in a physical sense, even though ב־ literally often means in. Hebrew ב־ covers both in and at in many situations.

They are related but not the same:

• ספר = barber / hairdresser
• מספרה = barbershop / hair salon

So:

• קבעתי תור אצל הספר = I made an appointment with the barber/hairdresser
• קבעתי תור במספרה = I made an appointment at the barbershop/hair salon

Both can work, but they focus on slightly different things:

• אצל הספר focuses on the person
• במספרה focuses on the place

Hebrew often uses העבודה by itself to mean work / my workplace, when the meaning is obvious from context.

So:

• ליד העבודה = near work / near my workplace

This is very natural in everyday Hebrew.

You could also say:

• ליד העבודה שלי = near my workplace

That is also correct, but often less necessary.

And:

• ליד עבודתי is grammatically possible, but it sounds much more formal or literary.

So in normal speech, ליד העבודה is exactly what you would expect.

Because in this kind of expression, Hebrew usually says the work when meaning one’s workplace / work in a general familiar sense.

So:

• ליד העבודה = near work / near the workplace

Hebrew often uses the definite article where English would not. Compare:

• אני בעבודה = I’m at work
• אחרי העבודה = after work
• ליד העבודה = near work

Saying ליד עבודה would sound incomplete or unnatural in most contexts.

Yes, only a small part would change.

A woman would say:

• מחר אני רוצה להסתפר, ולכן קבעתי תור במספרה ליד העבודה.

In writing, this sentence looks almost the same, but רוצה is pronounced differently:

• masculine: רוצה = rotze
• feminine: רוצה = rotza

The spelling usually stays the same in everyday unvocalized Hebrew.

Also:

• קבעתי = I made / I scheduled

is the same for both masculine and feminine in the I form.

And להסתפר is used by both men and women.

In modern Hebrew, מספרה can refer to a hair salon in general, for men or women.

Depending on context, it may be translated as:

• barbershop
• hair salon
• hairdresser’s

If you want to be more specific, context usually does the job. But מספרה by itself is broad enough for everyday use.

A simple transliteration is:

Machar ani rotze lehistaper, velakhen kavati tor bamispara leyad ha-avoda.

Approximate stress:

• maCHAR
• aNI
• roTZE / roTZA for a female speaker
• lehistaPER
• velaKHEN
• kaVAti
• TOR
• ba-mispaRA
• leYAD
• ha-avoDA

A couple of notes:

• ח in מחר is a throaty sound with no exact English equivalent.
• כ in לכן is also a guttural kh sound here.
• העבודה is often pronounced smoothly as ha-avoda.

Yes, but it would mean something different.

• קבעתי תור = I made an appointment
• אקבע תור = I will make an appointment

So if you say:

• מחר אני רוצה להסתפר, ולכן אקבע תור במספרה ליד העבודה

that means:

• Tomorrow I want to get a haircut, so I’ll make an appointment at the salon near work

That suggests the appointment has not been made yet.

In your original sentence, the appointment is already booked.