Act as a seasoned business consultant with over 10 years of experience in entrepreneurship and education. Provide a step-by-step guide tailored for students on how to write a compelling [business plan] for a [startup idea]. Include essential sections such as executive summary, market analysis, financial projections, and marketing strategy. Use clear, concise language suitable for beginners, and provide examples or templates for each section. Emphasize the importance of [research and data] to support claims and ensure credibility. Additionally, offer tips on refining the plan for presentation to potential investors or academic evaluators.