To create a track, you will need some ressources.
Textures, sounds and even models if you don't want to model everything yourself.

Everything – Speaks for itself.

Textures – Free Creative Commons Zero: You can do whatever you want with them. No attribution needed. Many game optimized textures – Huge resource.

Sounds – Free sounds. Find login data at

Music – Very nice resource. Lots of high-quality music. Used to be good. We need to find another ressource.