Would you ever think of taking a trip to a foreign location without some type of tourist guide or map? Could you imagine doing this and then the feeling of suddenly realizing that you have no idea where you are or what to do? I would imagine that would be a terrifying experience. Fortunately people take trips like this all of the time and these types of experiences are averted through proper planning. Operating a business without a business plan is like taking a trip without a map. You do not want to dedicate precious time to building a business only to suddenly realize that you have no idea where you are or what to do.
Who is going to review my plan, and what do you want them to do with it? You need to identify who is going to actually study your plan, and what they are going to do with it. If it's yourself, then it's a little easier to answer this question because the answer lies within you. If, however, you are writing your plan for others to review, and assuming you've answered #1 above, you're going to have to do some background analysis. Start listing names or titles/positions of people who you expect to review your plan. Then, for each person, brainstorm how you want that person to react to your business plan _ what they should do with it. You could do the same thing for investors _ do you know any business owners? Ask them what they would look for in any business venture they would invest, and specifically what they would look for if you wanted them to invest in your business.