On the subject of finance, you need to produce realistic financial details. How much money will the business require? What are the expenses required? How much tax will you need to pay? What are the profit margins? Do you stand a good chance of achieving these sums, and how? Finance plans should include income statements, cash-flow statements, balance sheets and profit analysis. This should form a big part of your business plan, in order to convince the vendor or bank manager of your credibility.
Finally, it's important to consider that when you're writing a business plan, you don't want to cut corners or rely on a sample plan from a book or website. The business plan is a representation of your professionalism and your desire to succeed, and the quality of your content should reflect this. So while tips and tricks are good for making the most out of your time and resources, it's never a good idea to gloss over important aspects of your plan - namely, the quality of your writing.