The guiding principle for writing the Method section is that it should contain sufficient information for the reader to determine whether methodology is sound. Some even argue that a good proposal should contain sufficient details for another qualified researcher to implement the study.
In general, the introduction of a research proposal should: 1) Summarize the current state of knowledge. 2) Identify the gap, question, or problem that motivates study. 3) Provide the objective(s) of study. In the Methods section of a research proposal: Describe methods in future tense NOT past tense.