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.
The New Basics of Business _ With unemployment continuing to rise, home prices falling due to a surplus of inventory, and small business lending at a standstill, this recession doesn't seem likely to end soon. The recovery will be slow and Americans will certainly not enjoy the prosperity of a few years ago for a long time to come. It's not just economists who think this way. "Half the population in [a] new ABC News poll thinks both job security and retirement prospects in the years ahead will remain worse than their pre_recession levels." ("Poll: Less Job Security is the 'New Normal,'" ABC News The Polling Unit, June 15, 2009, analysis by Gary Langer) This confidence, or lack thereof, is an integral part of an economic cycle. The analysis goes on to say, "Those diminished expectations _ plus the pain of the current downturn _ are fueling retrenchments in consumer behavior that could fundamentally reshape the economy."
Start by writing a description of your business, including what stage of development it is currently in (conception, start_up, first year, mature, exit) and your plans for growth. Discuss the nature of your business, the main products and services you offer, the market for your products and services, and how and by whom the business is operated.
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.