Introduction to Esperanto:
Lesson 24

In theory, there is absolutely no difference in what word order you use but, in practice, regarding the way Esperanto is spoken, you are more likely to hear say kie vi estas? instead of kie estas vi?. Either version is fine, though.

You can also ask and answer the question where are you from. It would logically be from where are you, or, as you usually (although not obligatorily) say it, from where you are?:

Where are you from?

Answer: De kie vi estas?
Not correct. Please try again.

I am from France.

Answer: Mi estas de Francujo.
Not correct. Please try again.