James J. Hill Reference Library (jjhill.org): One of the nation's premier business libraries to bring you FREE and affordably priced tools and resources you can use to create a better business plan based on relevant and credible data.
Apart from this, they also analyze consumer trends and gather legislation reports and regulations that might have a future impact on your particular venture. These expert individuals make it their responsibility to build upon previous experiences and the requirements needed for you to carry out your intended plan.
Impress for Success - Now you have to admit, this is going to make an impressive package! Put it in a binder and you have built something to be proud of - the first of your many business accomplishments. Your potential investors will appreciate the depth of your analysis, but this tool will prove helpful in describing your venture to your employees, customers, and suppliers, as well. After you have been up and running for a few months, you will find that the planning that you have done will sensitize your inner 'business compass' and allow you to flexibly adjust to contingencies. And that is indispensable!
While these are easily available online, some of them are way better than the others. A lot depends on the approach that goes into writing the business plan.