The key components of a business plan include an executive summary, a company description, market analysis, organization and management, products and services, marketing and sales, financial projections, and appendix.

To write a business plan, you should start by conducting market research and identifying your target audience. Then, you should outline your company's mission statement, goals, and objectives. From there, you should develop a marketing plan and sales strategy, and create financial projections. Finally, you should summarize your plan in an executive summary.

A marketing plan is a document that outlines the strategies and tactics that a company will use to promote its products or services to potential customers. It typically includes information on the company's target audience, branding, advertising, public relations, and sales promotions

You should update your business plan on a regular basis, typically every six to twelve months or whenever there are significant changes in your company's operations or market conditions.

To create financial projections for a business plan, you should start by estimating your revenue and expenses for the next three to five years. Then, you should create a balance sheet and cash flow statement, and calculate key financial ratios such as profitability, liquidity, and solvency.