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Easy Writer : If you are one who is intimidated by the blank page, never fear! There are several good software packages that will guide you through the process, such as Business Plan Pro Complete from PaloAltoSoftware. Business Plan Pro Complete walks you through the entire planning process and generates a complete, professional and ready to distribute plan with a proven formula for success.
But your idea may be so new that you may also need to talk to potential customers, host some focus groups, talk to an ad agency, or maybe even make a prototype and float it past some people. Be prepared to spend the time. Remember, it's not about the Plan but the Planning.
There are a number of ways of going about the process of writing a good business plan. One of the most tried and time tested ways that works well is using a business plan template.