Form. The style file will take care of this, but you should be aware of what is needed.
Contents. The table of contents describes the organization of your report. Here are some details about each section.
To elaborate, the Background section gives technical terms and concepts that are basic and serve to inform the reader who might not know such things. (It could just as well be titled Terms and Concepts; it's a matter of taste, as long as you choose a title that accurately describes the section's contents.) For example, the paper might be about certain graphs. The Background section introduces graphs, giving their formal definition, and whatever special graphs are appropriate for the particular project. The Background is also where many of the citations appear, describing some of the seminal works that are pertinent. For example, this can include a basic reference to graph theory for the reader to learn more general background, as well some reference(s) to a special graph that is the subject of the paper (eg, bipartite graphs).
Compared to the Introduction, both the purpose and the form are different. As a rule, the Introduction is short and is designed to give a succinct description of what follows, including the organization of the report. It is appropriate to see a paragraph that begins with: "The rest of this report is divided into n sections. Section 2 gives the background..." Also, the Introduction should motivate the reader, maybe offer some excitement about the subject. There is thus no chance to give background that might be necessary for the reader's comprehension. That's what the Background section does, including examples, figures, etc. - none of which have any place in the introduction.
Note: Some authors combine the functions of an introduction and background, in which case the section title reflects this. That decision is made by each Clinic Teacher.