So if you want to start writing, just do it. If you want to make writing a hobby, just do it. It's a great skill to have, and one that I think will become more and more valuable the more technology becomes entwined in our lives.
As always. a wonderfully crafted conversation. I especially liked your idea of jotting down notes on your phone. I usually do similar on my iPhone and let it simmer for at least a day or two, or longer. Often, a second conversation idea will appear during the simmering process and it becomes a deliberation as to which idea is more relevant or timely.