Research papers are not as strictly structured as legal memos, briefs, and other documents that you've learned about in legal writing and drafting courses. For example, there is no prescribed content/format similar to to the Questions Presented, Brief Answers, etc. that you learned for a legal memo.
Content
A general approach to thinking about the content of a research paper is:
See this blog post by Jonathan Burns, an IU McKinney alum, for more on basic content.
Format
If you're writing for a law review or seminar, you should get formatting instructions regarding things like margins, font size, line spacing. If you don't, or if you're doing an independent study, here are some basic guidelines to follow:
Headings and subheadings
Research papers should have headings and subheadings. These help your reader follow your logic--and a logical structure is very important. Headings and subheadings can also help you keep your thoughts organized. Just don't overuse them--you don't want every paragaph to have a subheading.
Road map paragraph
Often, research papers will also include a paragraph at the end of the introduction that narrates the road map the paper will follow. Here is an example of this kind of paragraph:
"The section that follows [this introduction] sets the stage by recounting two scenarios from the Indiana University Robert H. McKinney School of Law, with discussion of the knowledge and implementation of accessibility features in online instructional materials. The next section provides an overview of various impairments and their effects on a user's experience of the online environment. Next is a review of the laws relevant to accessibility with attention to their potential application to online instruction, along with standards used to guide accessibility compliance. The article then explores the concept of universal design and its guiding principles, followed by a discussion of how to use the universal design principles to organize and better understand accessibility standards and practices. The final section briefly summarizes the discussion and encourages law librarians and professors to become knowledgeable and skilled in universal design for online materials to benefit all their students."
Table of Contents
A table of contents can also be helpful, though it's not necessary. If you add a table of contents to your papers, put it right at the beginning, before the introduction. Here's part of the table of contents for the same paper the paragraph above was taken from--it really just lays out the heading and subheadings with page numbers: