Билетёрша сказала, что наш партер начинается с восьмого ряда.

Билетёрша means a female ticket attendant / usher in a theater or cinema.

A few useful notes:

• The base word is билетёр = a male ticket attendant.
• The ending -ша makes it feminine: билетёрша.
• In modern Russian, this word can sound a bit colloquial or old-fashioned to some speakers.
• You may also see билетерша without ё, because Russian often omits the dots in writing, but the pronunciation is still -тёр-.

So in this sentence, it simply refers to the woman working there who checked or directed people to their seats.

Because the subject, билетёрша, is feminine.

In the past tense, Russian verbs agree with gender in the singular:

• сказал = he said
• сказала = she said
• сказало = it said
• сказали = they said

So:

• Билетёрша сказала = The female usher said

Что here means that and introduces a subordinate clause.

So the sentence breaks down like this:

• Билетёрша сказала = The usher said
• что наш партер начинается с восьмого ряда = that our parterre/stalls starts from the eighth row

This is a very common pattern in Russian:

• Он сказал, что... = He said that...
• Я думаю, что... = I think that...
• Мы знаем, что... = We know that...

Also notice the comma before что. In Russian, a subordinate clause introduced by что is normally separated by a comma.

Because партер is a masculine noun.

The possessive pronoun наш changes to match the noun:

• наш = masculine singular
• наша = feminine singular
• наше = neuter singular
• наши = plural

Examples:

• наш партер = our parterre/stalls
• наша ложа = our box
• наше место = our seat
• наши билеты = our tickets

So наш is used because партер is masculine.

In theater vocabulary, партер means the stalls, orchestra seats, or main floor seating area in front of the stage.

It does not mean a single seat or a single row. It refers to a section of the theater.

So наш партер means something like:

• our stalls section
• the part of the floor seating our tickets are for

Depending on context, it may sound a little more natural in English as our section in the stalls rather than literally our parterre.

Because the verb here is начинаться = to begin / to start.

Compare:

• начинать что-то = to start something
  
  • Он начинает спектакль. = He starts the performance.
• начинаться = to begin, to start
  
  • Спектакль начинается в семь. = The performance begins at seven.

In your sentence, партер is not starting something else; it itself begins at a certain point. So Russian uses the reflexive form:

• партер начинается = the stalls begin / start

Because the verb начинаться commonly takes с + genitive to mean to begin from / to start at.

So:

• начинаться с чего? = to begin with / from what?

Examples:

• Фильм начинается с титров. = The film begins with the credits.
• Улица начинается с площади. = The street starts at the square.
• Партер начинается с восьмого ряда. = The stalls section starts from the eighth row.

So с here does not just mean physical with. In this pattern, it means from, starting at.

Because after с in this meaning, Russian uses the genitive case.

The basic form is:

• восьмой ряд = the eighth row

But after с with начинаться, it becomes genitive:

• с восьмого ряда = from the eighth row

Both words change as needed:

• восьмой → восьмого
• ряд → ряда

This is a very common thing in Russian: prepositions often require a specific case.

Восьмого is the genitive singular masculine form of the ordinal number восьмой (eighth).

Since ряд is masculine singular, the ordinal must agree with it.

Forms of восьмой include:

• восьмой ряд = nominative masculine
• восьмого ряда = genitive masculine
• восьмому ряду = dative masculine
• восьмым рядом = instrumental masculine

In this sentence, the preposition с requires genitive, so you get:

• с восьмого ряда

Yes. Both are good ways to understand it.

Natural English translations might be:

• starts from the eighth row
• begins at the eighth row
• starts with row eight
• the stalls section begins in row eight and beyond

The exact English wording depends on context, but the Russian idea is that rows before the eighth are not part of the section being referred to.

It has two parts:

1. Билетёрша сказала
   = The usher said

2. что наш партер начинается с восьмого ряда
   = that our stalls section starts from the eighth row

So the full structure is:

• [Main clause] + , что + [subordinate clause]

This is one of the most common sentence patterns in Russian for reporting speech or thoughts.

The word order is natural, but Russian allows some flexibility.

This version:

• Билетёрша сказала, что наш партер начинается с восьмого ряда.

is neutral and straightforward.

You could rearrange parts for emphasis, for example:

• Билетёрша сказала, что с восьмого ряда начинается наш партер.

That would put more emphasis on where it starts. But the original order is the most ordinary and easiest for a learner to use.

Yes, наш literally means our.

In context, it usually means the section assigned to us / the section our tickets are for. It does not necessarily mean ownership in a strong sense. Russian often uses possessive words this way in everyday situations.

So наш партер is best understood as:

• the stalls section for us
• our part of the stalls
• the stalls area we should go to

A few things:

• билетёрша is pronounced with ё: the stressed syllable is -тёр-.
• начинается is pronounced roughly like na-chee-NA-yet-sya, with the stress on -на-.
• восьмого has stress on the first syllable: ВОСЬ-мого.
• ряда has stress on the second syllable: rya-DA.

Even if Russian texts often omit ё, it is helpful for learners to remember it here: билетёрша.