Najprije ćemo pogledati vozni red, a odmah zatim ćemo otići na peron.

Najprije means first or first of all. In this sentence, it introduces the first action in a sequence.

It is very close in meaning to prvo, and in many situations they are interchangeable:

• Najprije ćemo pogledati vozni red.
• Prvo ćemo pogledati vozni red.

Both mean First we'll look at the timetable.

Najprije can sound a little more formal or careful in style, while prvo is often more everyday and conversational.

This is the Croatian future I tense.

It is formed with:

• a form of htjeti in its clitic future use: ću, ćeš, će, ćemo, ćete, će
• plus the infinitive of the main verb

So here:

• ćemo pogledati = we will look
• ćemo otići = we will go

The subject we is already contained in ćemo, which means we will.

In Croatian, the future auxiliary often behaves like a clitic, which means it tends to stand in the second position in the clause.

So:

• Najprije ćemo pogledati...
• Odmah zatim ćemo otići...

The word or phrase at the beginning comes first, and ćemo follows it.

You may also see forms like:

• Pogledat ćemo
• Otići ćemo

That is also correct. Croatian allows a few different word-order patterns, but clitics strongly prefer an early position in the sentence or clause.

The conjunction a often links two clauses in a loose sequence or contrast. Here it works very naturally as and then or and after that.

So:

• ..., a odmah zatim ćemo otići na peron.

This does not mean a strong contrast. It is more like:

• ..., and then right after that we'll go to the platform.

Using i is not impossible in some contexts, but a is very common when moving from one step to the next in a narrative or plan.

Odmah zatim means immediately after that or right after that.

It is made of:

• odmah = immediately
• zatim = then / after that

Together they emphasize that the second action follows the first one without delay.

Similar expressions include:

• odmah nakon toga = immediately after that
• a zatim = and then
• onda = then

Vozni red is a fixed expression meaning timetable or schedule, especially for transport such as trains, buses, or trams.

Literally:

• vozni relates to driving, travel, or transport movement
• red means order, arrangement, or schedule

So together, vozni red is the standard Croatian term for a transport timetable.

Examples:

• autobusni vozni red = bus timetable
• željeznički vozni red = railway timetable

This is about aspect, which is very important in Croatian verbs.

• gledati = imperfective, focusing on the process of looking/watching
• pogledati = perfective, focusing on the action as a whole, often a quick or completed look

In this sentence, the speaker means:

• first we'll take a look at the timetable

That is a single completed action, so pogledati is the natural choice.

If you said gledati, it could sound more like:

• we'll be looking at the timetable
• we'll spend some time looking at it

Otići is a perfective verb meaning to go away, to leave, or simply to go in many contexts.

Here:

• ćemo otići na peron = we will go to the platform

As with pogledati, this is a completed, one-time future action, so the perfective verb fits well.

Its imperfective partner is usually odlaziti:

• odlaziti = to be going / to go regularly / to leave repeatedly
• otići = to go, leave, depart once as a complete event

Because this sentence describes movement toward the platform.

With na:

• na + accusative = movement onto/to
• na + locative = location on/at

So:

• otići na peron = to go to the platform
• biti na peronu = to be on the platform

This is a very common Croatian pattern.

It is accusative singular because it follows na in a movement meaning: to the platform.

The noun peron is masculine and inanimate. For many masculine inanimate nouns, the accusative singular looks the same as the nominative singular.

So:

• nominative: peron
• accusative: peron

That is why the form does not change visibly here.

Yes, Croatian word order is flexible, but not completely free. Some alternatives are possible:

• Najprije ćemo pogledati vozni red, a odmah zatim ćemo otići na peron.
• Najprije ćemo vozni red pogledati, a odmah zatim ćemo otići na peron.
  This is possible, but less neutral.
• Pogledat ćemo najprije vozni red, a odmah zatim otići na peron.
  Possible, but stylistically different.

The original sentence sounds very natural and neutral.

A learner should especially remember that clitics like ćemo usually want to come early in the clause.

In Croatian, the verb form often already tells you the subject.

Here, ćemo means we will, so the subject we is built into the verb phrase. Because of that, Croatian often omits subject pronouns when they are not needed.

So:

• Mi ćemo pogledati... = We will look...
• Ćemo pogledati... is not used by itself at the start, but within a clause ćemo already shows we

The pronoun mi can be added for emphasis:

• Mi ćemo najprije pogledati vozni red... This would sound like We will first look at the timetable, perhaps contrasting us with someone else.

Not simply because they are in the future, but because the speaker sees them as completed steps in a sequence.

Both verbs are perfective:

• pogledati
• otići

That gives the meaning of:

1. we will first complete the action of checking the timetable
2. then we will complete the action of going to the platform

Croatian often uses perfective verbs in future plans when talking about single, complete actions. If the speaker wanted to emphasize duration or an ongoing activity, an imperfective verb might be used instead.