Welcome to Steemit @mateuspujol! :c)

A very interesting and varied background. It'll be interesting to see what you post about in the future.

Since you say you heard about Steemit from off of youtube, I feel it best to inform you to temper your expectations. Yes there is money to be earned on Steemit but you'll need to build a personal brand first (something tells me that you'll be fine).

Since you're new here, a quick read through this post may prove helpful.