Before you read anything else, the first thing that you need to understand is that proposals can be a huge waste of time for you and for your prospect. If they are not created the right way, and if the proper foundation hasn't been built, then you'll be spinning your wheels. Most proposals have a 25% win rate. If done right, your rate should jump to 60% _ 80%.
When new freelancers are creating a business proposal template that they are going to use often, they usually miss the most important pieces that make the difference between a good proposal and a proposal that sells. By emulating the sales process, you can create a proposal that solidifies the relationship that you've built with a prospect, and reinforces the close of your sale.