The free stroke is the most common type of stroke used in classical guitar technique, it is worth taking the time to develop the basic movement of your free stroke so that you can rely on a strong and consistent sound. Developing your sound and right hand technique can take years, but that is part of the fun!
The tone you produce with your free stroke is influenced by the shape and surface of your nail, the way you activate the string with your finger, and the consistent placement of your finger.
At this point in your development, you will benefit from experimentation and paying close attention to the sound you are producing. Just remember to keep your hand relaxed and let the natural curl of the fingers occur, free from tension.