Please start below.
If you feel unready to get started then just put “TBD” for “to be determined” for sections currently unknown, and prefacing sections that are still under development with “(under development)”. Then it can be shared which will foster collaboration as early in the process as possible.
After clicking “submit”, invite others to collaborate, and work toward research-design-excellence, rather than mere research-design-completion. Inviting others in on the design phase, before it’s fully “ready”, is a great way to get key players on board, improve buy-in, and improving study design before it’s too late to make design changes.