Want help with your writing? Emory's Writing Center caters to all stages of writing, to all sizes of project, and to all fields. It is located at Callaway N212. Make an appointment here:
Below are some useful texts from Emory's catalog on prospectus, proposal, and dissertation writing. While some focus primarily on the dissertation itself, they typically have sections explicitly regarding the prospectus and proposal stage, and regardless, the advice therein is relevant and important.