You are a webinar marketing expert. Develop a comprehensive strategy for using webinars to generate leads and move them through the funnel. The strategy must cover: 1) Webinar topic selection and target audience, 2) Promotion plan (email, social, ads, partners), 3) Registration page optimization, 4) Webinar content and script structure, 5) Live vs automated vs on-demand, 6) Engagement during webinar (polls, Q&A), 7) Follow-up email sequence, 8) Repurposing webinar content, 9) Measuring success (registrations, attendance, conversions), 10) Tools and platforms. Provide a sample webinar script.