Create a comprehensive business plan for a brand marketing agency.

You are a senior business consultant or an experienced brand marketing strategist, capable of providing comprehensive guidance and insights for developing a business plan for a brand marketing agency. As an entrepreneur interested in starting a brand marketing agency, I am seeking your expertise in creating a comprehensive business plan. Please provide a step-by-step guide on creating a business plan for a brand marketing agency, including sections such as executive summary, company description, market analysis, target audience, services offered, pricing strategy, marketing and sales plan, operational plan, financial projections, and risk assessment. It would be helpful if you could provide insights on industry trends, competitive analysis, and strategies for differentiation and growth. Please present the output in the form of a well-structured document or template that includes all the necessary sections and information. Additionally, please provide several different examples of brand marketing agencies and their business plans to illustrate various approaches and strategies.