Once you have decided where you wish to submit a grant, you will need to write a proposal. Keep in mind that every funding source will have different requirements; on the other hand, there is much that is standardized. Even when funding is not coming from a National Institutes of Health (NIH) grant, their format is commonly used.
National Institute of Allergy and Infectious Diseases (NIAID) resources
NIAID has one of the best sites for NIH grant applicants, regardless of area of research interest: