1. Pick up a pencil or pen
2. Find a piece of paper
3. Make marks of any kind—draw something in front of you, use your imagination or copy from another piece of art—it doesn’t matter what kind.
It really is that simple. No need for a trip to the art shop for materials, or permission from anyone else to get started. Step 3 will give you feedback to the kind of marks you enjoy making. By taking action you work out what to draw next. Just thinking about it could keep you from making anything at all (I’m not going to start if I don’t know what to draw) and as it doesn’t matter what you draw, you may as well pick ANYTHING and get started right now.