Ujutro se najprije umijem, a tek onda pijem kavu.

Ujutro is a fixed adverb meaning in the morning. In modern standard Croatian, it is usually written as one word when it has this general time meaning.

• Ujutro pijem kavu. = I drink coffee in the morning.

If you say u jutro as two words, that usually sounds less like the standard fixed adverb and more like a literal preposition + noun combination, which is not what is meant here.

Se is a reflexive clitic. It shows that the action is done to oneself.

So:

• umiti = to wash
• umiti se = to wash oneself, especially to wash one’s face

Here, umijem se means I wash my face or I wash myself in this specific sense.

In English, we often do not say myself in this kind of sentence, but Croatian often uses se.

Umijem is the 1st person singular present tense form of umiti se.

So the pattern is:

• ja se umijem = I wash my face
• ti se umiješ = you wash your face
• on/ona se umije = he/she washes his/her face

This verb is specifically about washing the face, not washing the whole body in general.

This is because se is a clitic, and clitics in Croatian usually go in the second position in the clause.

So in:

• Ujutro se najprije umijem

the first element is ujutro, and then the clitic se comes right after that.

You will often see this pattern in Croatian:

• Danas se osjećam dobro.
• Uvijek se sjetim toga.

Even though se belongs with the verb, its position is controlled by clitic placement rules.

Najprije means first or first of all.

In this sentence:

• Ujutro se najprije umijem = In the morning, I first wash my face

It is very similar to prvo, and in many everyday situations they can both work:

• Najprije se umijem, a onda pijem kavu.
• Prvo se umijem, a onda pijem kavu.

Both are natural. Najprije can sound a little more formal or a little more explicitly sequential, but the difference is usually small.

A tek onda means something like:

• and only then
• and not until then
• and only after that

The word tek adds emphasis. It shows that the second action happens only after the first one is completed.

So:

• a onda pijem kavu = and then I drink coffee
• a tek onda pijem kavu = and only then do I drink coffee

That makes the order feel stronger: washing comes first, coffee comes after.

In Croatian, a is often used to connect two clauses by contrast or sequence. It is very common and does not always mean a strong but.

Here:

• Ujutro se najprije umijem, a tek onda pijem kavu.

A links the two parts smoothly:

• first I wash my face,
• then only after that I drink coffee.

Why not the others?

• i = and; it would sound more like simple addition
• ali = but; it would sound too strongly विरोधive / contradictory

So a is the most natural connector here.

Because kavu is in the accusative case, which is the normal case for the direct object of the verb piti (to drink).

• nominative: kava = coffee
• accusative: kavu = coffee as the object

So:

• Kava je vruća. = The coffee is hot.
  Here kava is the subject.
• Pijem kavu. = I am drinking coffee.
  Here kavu is the object.

This is one of the first case changes learners notice in Croatian.

Croatian often leaves out subject pronouns when they are already clear from the verb ending.

Here:

• umijem already means I wash
• pijem already means I drink

So ja is not necessary.

You could say:

• Ja se najprije umijem, a tek onda pijem kavu.

But that adds emphasis, as if you mean I, specifically, do it this way.

Yes, pijem is present tense. In Croatian, the present tense can often correspond to both English:

• I drink
• I am drinking

In this sentence, because it describes a usual sequence or habit, English would normally translate it as:

• I first wash my face, and only then I drink coffee or more naturally
• In the morning, I wash my face first, and only then do I drink coffee

So the Croatian present tense is doing the job of a habitual present here.

The word order is fairly natural as given, but Croatian word order is more flexible than English word order.

The sentence:

• Ujutro se najprije umijem, a tek onda pijem kavu.

is natural and neutral.

Some other possible versions are:

• Najprije se ujutro umijem, a tek onda pijem kavu.
• Ujutro najprije se umijem, a tek onda pijem kavu.
  This is less natural because of clitic placement rhythm.
• Kavu pijem tek onda kad se ujutro umijem.
  This changes the structure more noticeably.

The important thing is that se must follow the clitic-placement rules, and word order changes often affect emphasis.

Usually no. Umiti se most commonly means to wash one’s face.

So this sentence suggests a morning routine like:

1. wash face
2. then drink coffee

If you want to talk about washing the whole body, you would more likely use verbs such as:

• oprati se = wash oneself
• tuširati se = take a shower

So umiti se is more specific than English wash.

Yes. Very naturally, it sounds like a habitual routine.

• Ujutro se najprije umijem, a tek onda pijem kavu.

This most naturally means something like:

• In the morning, I first wash my face, and only then drink coffee.

So it sounds like something the speaker regularly does, not just something happening once. Croatian present tense often expresses habits in exactly this way.