When I encounter a product I am unfamiliar with, my initial action is always to dedicate time to comprehending its details thoroughly. I would arrange meetings with various stakeholders, including development teams, marketing, and sales, to gather their insights and note any specific information regarding the product. After collecting significant information about the product, I would proceed to obtain data on its market performance, competitors, potential opportunities, and associated risks. With a solid understanding of the product and its market context, I would then begin to develop the roadmap. This would involve defining the product's goals and ensuring they align with the overall strategic objectives of the company. I would identify key milestones and set timelines for each task, ensuring that feedback loops are integrated at every stage. Furthermore, I would make it a point to continuously revise this roadmap as the product, market dynamics, and company priorities change.