When doing legislative history research, there's often no need to start from scratch. Prepared legislative histories range from a list of documents associated with a law, to gathered reprints of those documents, to narrative commentary on the ratification process. Check first for compiled legislative histories (gathered documents) in these resources.
Print and electronic compiled legislative histories in Paley Library are found via the Diamond catalog.
Print histories (often multi-volume) are found in Library of Congress call number order in the open stacks. Here's an example.
This integrated electronic and microfiche collection provides extensive legislative history resources. Search for materials by keyword, Public Law number, document number, and SuDoc number. Legislative Insight provides compiled histories. The CIS microfiche set provides many documents not included in the online collection. In addition to hearings and reports, these resources contain citations to discussion in the Congressional Record and Weekly Compilation of Presidential Documents.
These finding aids point you toward compiled legislative histories or lists of documents associated with bills and laws.
Law review articles may trace the development of a specific law. Search the standard legal literature databases in HeinOnline (Law Journal Library), LexisNexis Academic: Law Reviews to find such articles.
Narrative accounts may also be included as chapters in books. Use LibrarySearch to find books on your topic.
Over the years the U.S. Department of Justice staff compiled legislative histories. The very select list of histories available is at the DOJ website.