Advertising Agency Proposal

I require an example document of a proposal that an Advertising Agency or Creative Company would provide to a major client. I do not need you to prepare such an agreement, I am simply looking for a sample that I can use as the basis for my own. You cannot source this from the internet. I have already researched the web and the templates I have found do not have the detail I require. Please let me know the components your sample would include, and a few sample screenshots if possible. Thank you.