אני לא רוצה להתחיל ויכוח כזה עכשיו.

A natural pronunciation is:

ani lo rotse / rotsa lehatchil viku'ach kaze akhshav

A few notes:

• רוצה is pronounced rotse if the speaker is male, rotsa if the speaker is female.
• עכשיו is pronounced akhshav.
• The ח sound in ויכוח and עכשיו is the throaty kh/ch sound, like in Bach.

Yes, Hebrew can sometimes leave subject pronouns out, but here אני is very natural and often helpful.

Why?

• In the present tense, Hebrew verbs usually do not clearly mark person the way English does.
• רוצה can mean I want, you want, or he wants, depending on context and pronunciation.
• So אני makes the sentence clear: I do not want...

You may hear לא רוצה להתחיל ויכוח כזה עכשיו in casual speech if the context already makes I obvious.

Hebrew does not use an extra helping verb like English do in I do not want.

Instead, it simply puts לא before the verb:

• אני רוצה = I want
• אני לא רוצה = I do not want

So the structure is basically:

I + not + want

Because after רוצה (want), Hebrew normally uses an infinitive, just like English uses to + verb:

• רוצה להתחיל = want to start

The ל at the beginning of להתחיל is part of the infinitive form and often corresponds to English to.

So:

• להתחיל = to start / to begin

Yes, in speech it does:

• male speaker: rotse
• female speaker: rotsa

But in normal unpointed Hebrew writing, both are written the same way: רוצה.

So from writing alone, you usually cannot tell whether the speaker is male or female unless the context tells you.

ויכוח means argument, dispute, or sometimes debate, depending on context.

It usually refers to a verbal disagreement, not necessarily a physical fight.

So it is closer to:

• an argument
• a dispute
• a quarrel than to something like a fight in the physical sense.

Because את is used before a definite direct object.

Here, ויכוח is indefinite:

• ויכוח = an argument not
• הוויכוח = the argument

So:

• להתחיל ויכוח = to start an argument
• להתחיל את הוויכוח = to start the argument

That is why את is not used in this sentence.

Here כזה means something like:

• such
• like that
• of that kind

So ויכוח כזה means:

• such an argument
• an argument like that

The exact English wording depends on context, but the basic idea is that kind of argument.

This is a very common point of confusion.

• ויכוח כזה = such an argument / an argument like that
• הוויכוח הזה = this argument

So:

• כזה describes the type or kind
• הזה points to a specific one

Compare:

• אני לא רוצה להתחיל ויכוח כזה = I don't want to start that kind of argument
• אני לא רוצה להתחיל את הוויכוח הזה = I don't want to start this argument

Because in Hebrew, words like כזה usually come after the noun they describe.

English says:

• such an argument

Hebrew says:

• ויכוח כזה

Also, כזה must match the noun in gender and number. Since ויכוח is masculine singular, Hebrew uses כזה.

Other forms would be:

• masculine singular: כזה
• feminine singular: כזאת / כזו
• plural: כאלה / כאלו

Yes, it can move, but the sentence as given is very natural.

• אני לא רוצה להתחיל ויכוח כזה עכשיו = I don't want to start an argument like that now

Putting עכשיו at the end is a normal, neutral way to add the time meaning.

Other placements are possible for emphasis, for example:

• עכשיו אני לא רוצה להתחיל ויכוח כזה = Right now, I don't want to start that kind of argument

So the end position is not the only option, but it is a very common one.

Yes. The sentence is very natural.

Its structure is:

• אני = subject
• לא רוצה = negated verb phrase
• להתחיל = infinitive
• ויכוח כזה = object
• עכשיו = time adverb

So the pattern is roughly:

I + not want + to start + such an argument + now

That is standard and idiomatic Hebrew.