I'm starting this journey of writingwriting journey to improve my English.

More natural

My ainspiration for this decision, was to start teaching kids English, and also to make some money from it.

Aspirations are hopes and dreams, inspiration is like motivation

sSo here I am , enthusiastic about improving myself.

So far, I've learned English by going to classes, watching sitcoms without subtitles (like fFriends and HIMYM), and reading books written in their original language.

Names are always capitalized (Friends, the show)

My future goal is to reach a fluent level of speaking, or perhaps (to) study abroad.

You can lean on the first "to," no need to repeat it

Besides studying English,i I also enjoy listening to music-, specially jazz-, and painting.

I would go for commas or even parentheses instead of dashes here

That wa's it for my first post.

Since you are still here in the present writing the post, you'd use "is" not "was"

first take

We usually capitalize titles: First Take

I’m starting this journey of writing to improve my English.

My aspiration {for | behind} this decision, was to start teaching kids English, also to make some money from it.

sSo here I am , enthusiastic about improving myself.

So far, I’ve learned English by going to classes, watching sitcoms without subtitles (like fFriends and HIMYM), and reading books written in their original language.

Be careful of the spacing around punctuation.

My (future) goal is to reach a fluent level of speaking or perhaps to study abroad.

“Future” is unnecessary unless you somehow mean it’s not your goal now, but it will be your goal in the future.

Besides studying English,i I also enjoy listening to music-—especially jazz- —and painting.

That was it for my first post.

more natural: This is it for my first post.

Thank you very much, h. Have a great day.