<em>Muchacha would not be the correct answer because it is male you are referring to. </em>
The answer is :
Una carpeta
Necesito una carpeta para guardar todas las hojas de papel.
Ask your friend what their daily routine is and write yours as well, and starting from the beginning compare them. Say you compare yours to mine, I wake up at around 7, I change, then make coffee, eat something and get my school stuff together. Usually, I start school at about 7:30 or sometimes I procrastinate and start at like 8:30. I work till about 12 or 1, then eat lunch while I work. When I'm done I get back to work till 3 or 4. After that, I work on one of my hobbies (dance, music, journaling, etc.). I go to bed (not sleep) at 10 or 11 but don't fall asleep till like 3-5 am the next day.