You may even find a form that has already been completely filled out that will allow you to see exactly how a successful proposal should be written. In most cases the forms will include spaces for you to add pictures, charts and graphs as necessary to explain your proposal in such a manner that makes it much easier for the reader to understand your proposal. In many cases the more detail used to explain a proposal, the better the odds are that you are going to be submitting the winning bid.
It's all about the relationship first. Many newbie business owners give a proposal to anyone that they think seems interested in their services. That is an easy way to waste your time. Before you submit a proposal, you should have already developed a strong relationship with the buyer and showed the value that you are going to deliver. Your proposal should be a reiteration of that value and relationship and should only be submitted when you know that you are going to make the sale.