Chances are, you're already relied on the internet to gain guidance about projects you've never done before, or looked up instructions for a complicated process. There's a lot of information online about writing a business plan and you can easily find a sample plan, but not all of that information is quality, or worth your time. So how do you effectively search for web resources that will actually help you instead of wasting your time? Much like any kind of internet research, the tip is to begin by using only credible resources. In addition to searching for "writing a business plan", or "sample business plan", type in "business school" as well. Many business schools around the nation have free, available information for the public on how to write a business plan. They may include links to area-specific resources, or provide tutorials or downloads for a sample business plan.
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.