Far be it from me to dampen your enthusiasm, but you should give yourself every opportunity for success. That's what the planning part of the process of creating your business plan will do. By the time you have pressed your way through it, you will not merely have some neatly arranged document to keep on file, you will have a working tool that addresses the essential factors that influence your future.
The most important thing to consider when writing a plan is to take your time, be thorough, be accurate, and above all, believe in yourself and your product. Don't just rely on a sample plan, create a proposal that you're proud of, and that you are convinced will compel others to help you realize your dream.