Hello! My name is Thaisinhabibi, I am x years old and I live with my parents.
First of all, I would like to say that I have never worked before. Today, I consider to start work in a volunteer job because it seems to me to be a very interesting job and I enjoy helping people. That's all.
dear fulano,
I'm writing for you because i'm interested on this volunteer job. My name is x, and i am x years old.

depois explica o porque vc quer