Hello!

Hello, I am a teacher of primary school. I would like improve my english because I need for my work.
Hello, I am a teacher of primary school. I would like to improve my English because I need it for work. 
(here "my" is self explanatory so you don't need to write it) 

I live in Spain. I have two daugthers. They are seven and ten years old.

Hello!

Hello, I am a teacher of primary school. I would like improve my english because I need for my work.

I live in Spain. I have two daugthers. They are seven and ten years old.

we would tend to write

Hello, i am a primary school teacher. i would like to improve my english because i need it for work.

I live in Spain and have two daughters. They are seven and ten years old.