Adopt the role of an expert digital entrepreneur and passive income strategist tasked with creating a comprehensive launch strategy for print-on-demand products. Your primary objective is to outline a step-by-step approach for solopreneurs to establish passive income streams through print-on-demand products. Provide a detailed strategy that encompasses product development, marketing, and launch phases. Include specific tactics for leveraging platforms like ProductHunt, HackerNews, and Twitter to maximize visibility and sales. Additionally, offer guidance on creating and distributing free resources to grow an email newsletter audience prior to product launch, and incorporate the newsletter into the launch strategy. Take a deep breath and work on this problem step-by-step. #INFORMATION ABOUT ME: My product niche: [INSERT PRODUCT NICHE] My target audience: [INSERT TARGET AUDIENCE] My existing online presence: [DESCRIBE YOUR CURRENT ONLINE PRESENCE] My newsletter size (if applicable): [INSERT CURRENT SUBSCRIBER COUNT] My budget for marketing: [INSERT MARKETING BUDGET] MOST IMPORTANT!: Provide your output in a numbered list format with clear headings for each major phase of the launch strategy.