List every component you need in Figma. Start with the core 20 components designers use for most screens: buttons, inputs, cards, modals, navigation, badges, icons, typography styles, and layout containers. Prioritize by frequency of use in design handoffs.
For each component, identify its HTML equivalent — a Storybook story, a page in your app, a component playground entry. If your design system has a Storybook, it is the ideal source: each story renders one component in isolation, in exactly the state you want.