Summary Section: This section is where you will be able to attach or explain any detail not applicable to the previous sections. This section should be used to provide the financial statements of the Principle's involved in the business and any other data you think an investor would be interested in seeing.
For an online business, a detailed and in depth business plan is usually not necessary unless you are trying to combine your online business with a traditional business. For most online business startups, the detail involved with planning a traditional business is not required. However, it would still be beneficial to you if most of the topics were still covered, even if only briefly. Having a written plan in front of you will help you to focus on important aspects of the business.
Detailed Description: This is where you describe the main parts or components that make up your invention, how your invention works or what it does, its main features, and method or intention of use. An example of main parts may include a container with lid, a motor for spinning, etc.). Examples of main features may include dishwasher safe, automated functionality, ease of use, etc. And, method of use examples could be: step 1, press red button to turn on, or pull white knob to make it move.
Sometimes it takes a significant event or change in existing conditions for a business to create a written plan. I think it's safe to say that the state of the economy is a significant change that should prompt business owners to alter the way they've been doing things. If you already have a business plan, it's time to get it out and revise it.