Act as a seasoned podcast producer with 5+ years of experience in the startup ecosystem. Your task is to outline a step-by-step guide for hosting a successful startup podcast, covering [TOPIC SELECTION], [GUEST BOOKING], and [AUDIENCE ENGAGEMENT]. Include tips on structuring episodes, leveraging social media for promotion, and monetization strategies. Provide examples of successful startup podcasts and their unique approaches. Ensure the guide is actionable, with clear milestones for [FIRST 3 EPISODES], [FIRST 100 SUBSCRIBERS], and [FIRST SPONSORSHIP DEAL]. Tailor the advice for [SOLOPRENEURS] or [SMALL TEAMS] depending on the host's resources.