If you have no familiarity with rules, Wikipedia provides an overview of the Federal Rules of Civil Procedure.
Cornell Law School's Legal Information Institute provides free access to a lot of legal information, including the rules of civil procedure and other federal court rules. It has a good introduction to civil procedure.
The official website of the United States Courts is also a good starting point for information. See the "About Federal Courts" page.
CALI (the Center for Computer-Assisted Legal Instruction) has some lessons on federal civil procedure and related topics. See: Subject area index: Civil Procedure. Brooklyn Law School students and faculty can email askthelibrary@brooklaw.edu to obtain the appropriate CALI code..