Rules or Laws to guide sectioning and sub-sectioning
Certainly there are no laws on such things. In general the layout depends on the material and the audience.
But it looks like you are writing something as part of a proposal, maybe for a research grant. In that case, the recipient might have requirements for what to include in the application. You need to cover all of those things, of course. And it is often best to include them in your application in the order of the requirements listed. This makes it easier for the reader, who has some power to accept or reject, to quickly check that you have all of the needed elements.
But as a general outline, what you have seems to be reasonable.  As a &quot;working document&quot; is is fine. Tailor it to the requirements of the audience, however.