According to the Swedish Research Council, a research plan should include the following headings in order:
Given that you are not (yet) established researchers, you may not have much to say under the headings Significance and scientific novelty and Preliminary and previous results. Similarly, the subheading Project organization is less relevant for a one-person project. These sections (marked by an asterisk) are therefore optional. This means that you can use them if you have something relevant to say, but you should exclude them otherwise.
Of the remaining (obligatory) sections, you should devote at most half a page to Purpose and goals, at most one page to State of the art, and at least one and a half page to Project description. The entire proposal should be at most 3 pages long (and not much shorter).
You should use the following LaTeX document as a template for your proposal: project-proposal.tex. In order to process the file, you will also need the following example bib file: project-proposal.bib. If you have questions about this, come to the LaTeX tutorial.