What should be included in a data entry proposal letter? Discover what a bid proposal is, the elements of a bid proposal, how to create one and a template and example that can guide you.These are both real Upwork proposal samples that I sent out and got jobs from. Feel free to use these Upwork proposal templates for yourself. Request for Proposal. All proposer's must fill out, sign and submit the "Certification Regarding Debarment,. Want to write a proposal, but not sure where to start? Here are some easy examples to read through and get an idea of how to write a proposal for Upwork. A proposal for a freelancer is a written document submitted to a potential client in response to a job posting or inquiry.