Having played the piano most of my life I only started composing when I started spontaneously dropping by the music practice rooms at UC Berkeley in the middle of the day. Without any music I was practically forced to start making things up. Every now and then it’s new and nice. You can listen to a few short piano pieces on youtube.
I strongly believe in this as advice, but it does presuppose years of copying and playing others’ music as well as the basics of music theory. Replicate, then innovate.