No matter how great your idea is, most people expect that you have it written down. When I was new to inventing, I had no idea what that meant. I searched around but didn't find any universal format for documenting my ideas.
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.
If an online business, you need to go into detail how you will attract customers to your website. General statements like "I will use Face Book ads and email marketing" will contribute almost nothing to helping your cause unless you have detailed statistical analysis of tests you have conducted or of another similar business you have been associated with. If you do not have any data upon which you reference your estimates, it could show lack of proper thought to the remainder of your business plan.
So, although a detailed business plan may not be required for an online business, I am going to include it here so you can at least look at and consider each section and determine yourself if it applies to your business.
simple business plan example