Om vi flyttar till landsbygden, vill jag bo nära sjön.

Om means if in this sentence. It introduces a condition:

• Om vi flyttar till landsbygden = If we move to the countryside

This is very common in Swedish for conditional sentences.

Swedish often uses the present tense to talk about the future when the context makes it clear.

So:

• vi flyttar literally looks like we move
• but here it means we move / we are going to move

Because Om sets up a future condition, Swedish does not need a separate future tense form here.

Landsbygden is the definite form, meaning the countryside.

• landsbygd = countryside, rural area
• landsbygden = the countryside

In Swedish, some expressions naturally use the definite form where English does not always emphasize the in the same way. After till with places or areas, this is very common:

• till staden = to the city
• till landsbygden = to the countryside

Landsbygden means the countryside or the rural area.

It refers to places outside towns and cities, with fewer people and more nature. It is the opposite of:

• staden = the city
• landet can sometimes mean the country / countryside, but landsbygden is more specifically rural areas

This is because of Swedish word order.

The sentence begins with a subordinate clause:

• Om vi flyttar till landsbygden = If we move to the countryside

When that clause comes first, the main clause follows, and Swedish puts the verb in second position. This is the V2 rule.

So:

• Om vi flyttar till landsbygden, vill jag bo nära sjön.

Not:

• Om vi flyttar till landsbygden, jag vill bo nära sjön.

This inversion is very important in Swedish.

Compare:

• Jag vill bo nära sjön.
• I så fall vill jag bo nära sjön.
• Om vi flyttar till landsbygden, vill jag bo nära sjön.

In each case, the finite verb (vill) comes second.

Sjön is the definite form of sjö:

• sjö = lake
• sjön = the lake

So nära sjön means near the lake.

In context, the speaker has a specific kind of place in mind: if they move to the countryside, they want to live near the lake, or near a lake understood as a concrete nearby feature. Swedish often uses the definite form in such natural location phrases.

Yes, nära works like a preposition here and means near.

• nära sjön = near the lake
• nära huset = near the house
• nära stan = near the city

It does not need another preposition after it.

Bo means to live in the sense of reside or live somewhere.

• bo i Stockholm = live in Stockholm
• bo nära sjön = live near the lake

Leva means to live in the broader sense of be alive or live a certain kind of life.

So here bo is the correct verb because the sentence is about where someone wants to live.

The comma after the first clause is natural and helpful:

• Om vi flyttar till landsbygden, vill jag bo nära sjön.

In Swedish, commas after introductory subordinate clauses are often used to make the sentence easier to read. In modern writing, punctuation can vary a little, but this comma is completely normal and appropriate.

Yes. You can reverse the clauses:

• Jag vill bo nära sjön om vi flyttar till landsbygden.

That is also correct.

The difference is mainly one of emphasis:

• Om vi flyttar till landsbygden, vill jag bo nära sjön.
  This emphasizes the condition first.
• Jag vill bo nära sjön om vi flyttar till landsbygden.
  This emphasizes the wish first.

Notice that when the sentence starts with Jag, the normal word order is:

• Jag vill bo ...

But when the Om-clause comes first, you get inversion:

• ..., vill jag bo ...

It is a subordinate clause, not a full independent sentence in this context.

It has a subject and verb:

• vi = subject
• flyttar = verb

But because it starts with Om (if), it depends on the main clause to complete the idea.

So:

• Om vi flyttar till landsbygden ... = If we move to the countryside ...

The listener expects more information.

A natural stress pattern would often be something like:

• Om vi flyttar till landsbygden, vill jag bo nära sjön.

The strongest stress often falls on the most important content words, especially if the speaker is expressing a preference:

• flyttar
• landsbygden
• bo
• sjön

If the speaker wants to emphasize the location preference, sjön may get especially strong stress:

• ... vill jag bo nära SJÖN.

If they want to emphasize the condition, flyttar or landsbygden may get more stress instead.