The Internet is a good source because you can find business plans that will tailor fit any industry that you may want to get into - be it a food business, boutique or service - based venture. With samples in the Internet, you can also find plans of thriving businesses. And to someone who is just starting out, checking out plans of successful businesses can greatly help with goal formation. Another plus is that, you can also find free templates that can have you get started as soon as possible.
Estimated Manufacturing Cost: The ideal situation is to contact manufacturers to get a price quote of how much it would cost to build your invention. But this can be difficult if you don't have exact specifications. The other suggested general rule is to divide your Suggested Retail Price by a factor of 4. For example, if your suggested retail price is $80, then your Estimated Manufacturing Cost is $20.
I also said that a business plan consists of a narrative and several financial worksheets.
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.