Question

Aquí está tu cuaderno. ¿Dónde ?

Answer 1

For this case we have an answer and what we should do is to ask the right question to receive that answer.

The answer is:

Here's your notebook

The question you must ask is:

Where is my notebook?

The translation of the question in Spanish is:

¿Dónde está mi cuaderno?

Answer:

The question you must ask is:

¿Dónde está mi cuaderno?

The answer is:

Aquí está tu cuaderno

Answer 2

Aqui esta tu cuaderno. Donde lo pongo?
You need to use lo because cuaderno is masculine and singular form.