First notebook entry: Introducing myself

My name is Tuoanh. I am twenty-one years old. I come from Vietnam.

These are the proper sentences. :)

I come from Vietnam is perfectly correct.

First notebook entry: Introducing myself

My name is tuoanh.
21 years old.
I am come from vietnam.

(since if you want to tell others that from which country you belong, so you must say "I am from Vietnam" instead "I come from Vietnam")