Start today! Write about whatever that sparks your passion! Find yourself a writing and review buddy. It can be your mentor, can be your mentee or simply someone else that likes to learn their stuff through writing as much as you do! Medium makes a great medium for learning and discussing your ideas before and after you hit the publish button. When you share your thoughts with your review buddy, you will get off the procrastination path and you will hit that publish button sooner than you can imagine.