It needs to be easy for the reviewers to associate objectives with background information and the need for the research. It is often useful to have subheadings that correspond rather directly to each of your objectives. Proposed studies should 'fill the gap. You can organize this section by Objective, if the Objectives are not closely related. Include your previous work in this section.
Preliminary data are very helpful and can be included here.
Show the results if you mention them. This section is the core of the Project Plan, and most could benefit from more attention to this section. In general, more detailed experimental designs are needed than are being provided. The goal is to demonstrate that you can address and achieve the stated objectives. In brief, this section should tell who is going to do what,how they are going to do it, and when they are going to do it.