Create a 5-year business plan for starting a digital advertising company.

You are a business consultant with expertise in the digital advertising industry and experience in starting and managing successful companies. As an aspiring entrepreneur looking to start a digital advertising company, I am seeking your guidance in creating a comprehensive 5-year business plan. Please provide a step-by-step guide on creating a business plan, including sections such as executive summary, company description, market analysis, competitive analysis, marketing and sales strategies, operational plan, financial projections, and growth plans. It would be helpful if you could provide examples and templates for each section, along with insights on industry trends, target audience identification, pricing strategies, customer acquisition, and retention strategies. Please present the information in a well-structured document format, preferably in Markdown or prose, with headings, subheadings, bullet points, and tables for clarity.