This is a good request. Here are the three important points that all business plans need to have.
First, a business plan should address what you plan to do. So, if you plan to sell office supplies, then you should lay out this fact. A general description is the point, so that all will know what your company is about.
Second, a successful business plan also should show how you plan to achieve what you set out to do. How will you get supplies? How will you ship your office supplies? How will you market your products?
Third, you will need to do some market research. Are there other companies that do what you do? If so, why would a person use your company? This comparative study will be important to make a business plan successful.