As defined by Wikipedia:
"Pointillism is a technique of painting in which small, distinct dots of color are applied in patterns to form an image. "
Step 1: Add Dots, One at a Time
Seriously, that's how it's done. "See" what you want to create on your canvas and start layering your dots. Remember, the larger and darker your dots are, the more they stand out. I'm working on that in order to master shading and perspective in my art. Would love to see any of your Pointilistic art!