I say that because of course you need to be careful with commercially sensitive ideas, as you do not want to pass your plan on to someone in the pub who then starts your idea before you across the road.
For any organization, various functional plans-marketing, financial, human resources, production-have to be laid down, even though all the functional plans serve different purposes and all theses plans provide guidance and structure to the successful running of the business.
A successful project report must achieve the following objectives: Be appropriately arranged, with an executive summery, a table of contents and its chapters in correct order ; Be the right length and have the right appearance ; Give a sense of what you and your company expect to accomplish ; Explain in quantitative and qualitative terms, the benefits to the user of your company products and services ; Present hard evidence of the marketability of the products and services.
But do not be too paranoid, make sure you are showing it to people you trust, whose feedback you welcome and can be genuinely useful in guiding how the plan takes shape. Very often when working as individuals we get very close to certain details and miss out a big thing that has slipped your mind.