Hi Layah
I think writing out your ideas in the form of a business plan helps articulate what it is you really want to do with your business. Regardless of whether you are raising capital or seeking a business loan having a business plan is like having the recipe for a meal.
Your business plan should cover:
*A background of you and your business' history incuding what relevant skills you and your colleagues bring to the business that will contribute to its success
*What your business plans to do
*A market analysis - basically some research into your target market ie Who are your potential customers? What is the size of your market? Who are your competitors?
*Marketing Plan - A description of how you are going to go about attracting customers
*Operations Plan - A description of the day to day activities of the business, incuding who is responsible for the key areas of your business
*SWOT Analysis - stands for Strengths, Opportunities, Weaknesses & Threats. The names are fairly self explanatory and are important to consider all 4 aspects when planning your business
*Cashflow Analysis - This is a very crucial part of the business plan and allows you to budget out your marketing activities against expected revenue. It is very important that you manage your business well within its means. The vast majority of small businesses fail due to lack of funding not bad ideas.
I hope this helps explain the importance of having a business plan. I have written a number of articles on business planning that you may wish to checkout at
www.smallbusinesswizardry.com