The way we usually do it it: Objective A,B,C. Action A, Result A, Action B, Result B.
You want to make sure you're clear about your objectives and the client knows what success will look like weeks/months from now.
Simple Headers and bullet-points are enough. This is a good example of really simple and useful document - http://webmeup.com/downloads/seo-checklist.pdf
Also, don't forget about some conclusions, where you basically just wrap up everything, in case the client isn't patient enough to read the whole document.