بداية اللعبة منيحة.

A rough pronunciation is bidaayet il-liʿbe mniiha.

A few notes:

• بداية → bidaayet
• اللعبة → il-liʿbe
• منيحة → mniiha

The sound ح in منيحة is a stronger, breathier h than the normal English h. Exact pronunciation can vary a bit by region.

Because Arabic usually drops is / am / are in the present tense.

So:

• بداية اللعبة منيحة = The beginning of the game is good

This is called a nominal sentence: a subject plus a description, with no present-tense copula.

If you wanted past tense, you would normally add a verb:

• كانت بداية اللعبة منيحة = The beginning of the game was good

Yes. بداية اللعبة is an iḍāfa construction, often called the construct phrase.

It works like:

• بداية = beginning
• اللعبة = the game

Together:

• بداية اللعبة = the beginning of the game

Arabic often uses this structure where English uses of.

Because in an iḍāfa, the first noun usually does not take ال.

So:

• بداية اللعبة = the beginning of the game

The whole phrase is definite because the second noun, اللعبة, is definite.

So this is correct:

• بداية اللعبة

And this is not how Arabic says it:

• البداية اللعبة

Because بداية is a feminine noun, and the predicate adjective agrees with it.

So:

• بداية = feminine
• منيحة = feminine form of good

That is why you get:

• بداية اللعبة منيحة

If the noun were masculine, you would normally use منيح instead.

Because منيحة here is not an attributive adjective inside the noun phrase. It is the predicate of the whole sentence.

So the structure is:

• بداية اللعبة = the subject
• منيحة = what is being said about it

That is why the sentence means:

• The beginning of the game is good

If you put an adjective directly with a noun, Arabic also puts the adjective after the noun, but that would be a different structure.

It is a mix of very natural elements for spoken Levantine.

• بداية and اللعبة are also fine in Standard Arabic
• منيحة is clearly colloquial Levantine

In Standard Arabic, you would more likely hear:

• بداية اللعبة جيدة

So the sentence feels basically like spoken Levantine with a vocabulary item that also exists in Standard Arabic.

Because the Arabic definite article ال changes its pronunciation before certain letters called sun letters.

The letter ل is one of those letters, so the l sound gets doubled in pronunciation.

So:

• written: اللعبة
• pronounced in Levantine: il-liʿbe

In other words, the article blends into the first consonant of the word.

It depends on the word and how it is used.

• In بداية, because it is in an iḍāfa with the next word, the ending is often pronounced like -et:
  bidaayet il-liʿbe

• In اللعبة, at the end of the word in Levantine, ة is usually pronounced more like -e:
  liʿbe

• In منيحة, it is often pronounced like -a or -e depending on dialect and speaker:
  mniiha

So the same written letter ة can sound a little different depending on context.

Yes, in many Levantine varieties you can.

So:

• بداية اللعبة منيحة
• بداية اللعبة كويسة

Both can mean that the beginning is good. The exact feel depends on region and speaker preference, but both are natural colloquial choices.

It can mean either, depending on context.

• لعبة can mean game
• It can also mean toy

In this sentence, the intended meaning is clearly game, because بداية اللعبة naturally means the beginning of the game.