This article is in the current issue of Digital Photo Pro and I found it available online.
Case Study: Producing A Successful Estimate | DigitalPhotoPro.com

It's a good overview of the thought process and considerations in estimating a shoot and the value of the images.
At first read one might think "Thats above my level in the industry." That's irrelevant. What matters is the client's level/expectation in the industry...as long as you can deliver the results.