Good job Nuria! Es muy dificil para trabajar y tambien aprender idioma nueva.
Most of your writing is correct! Here are various other ways that you could say this in English.
<em>I start!</em>
I'm starting!
I am beginning!
Here I go! (slang)
<em>Hi everybody,</em>
Hey guys,
Hi folks (slang)
Sup peeps (slang)
<em>I'm an elementary school teacher.</em>
I teach elementary school.
I am a teacher at an elementary school.
<em>Now I take a break for my studies of doctorate.</em>
I'm taking a break to study my doctorate.
Now I am having a break and am studying for my doctorate.
I am taking time off to work on my PHD.
<em>I like to travel so is necessary for my this language.</em>
This language is important because I like to travel.
I love traveling so learning this language is necessary.
I enjoy being able to travel so learning a new language is a must.
<em>In the place where I live we speak Catalan and Spanish, nobody speak in English, so is difficult for my to learn without travel.</em>
Where I live, people only speak Catalan and Spanish. This makes it difficult to learn without traveling.
People only speak Catalan and Spanish here. This makes it harder to learn.