The supporting documentation for your idea(s) can fall into one of three categories
Investors are looking for the same things when reading a business plan. They want to know how big the opportunity is. Whether the assumptions the opportunity is based on is realistic, Whether this is the right team to exploit the opportunity and why. Who the competition is. What the risks are. Your job in writing the business plan is to address these questions convincingly and clearly.
Highlight the skills your team has. If your business hinges on a particular competency your plan will be more persuasive if one of your team members knows something about it and that is shown by the plan. Rather than describing the team members generally, tailor the resumes to draw out the experience each member has that will make him or her a valuable contributor.
Investors see many business plans. A 20-page plan, which clearly lays out your business is far more likely to be read than a 100 page plan.
Some entrepreneurs use a 15 slide Powerpoint presentation. If your text is short and punchy, you won't need to repeat yourself, because the reader won't be bogged down keeping ten chapters in their head. Reading the same thing over and over, even if it's in different words, is tiring. The briefer you can be the more likely it will be read.
If you can't explain your idea in English, either you don't understand what you're talking about. Convince the reader you will be the best because your idea is the best, not because you can string a dozen buzzwords together.
In each section, back up your assertions with solid facts. Even if you are a new venture and cannot give specific figures on the performance of your business, quote figures for the industry or your competitors. These real figures carry more weight than your assumed projections and give more reality to your plan.