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. Brooklyn Law School students and faculty can email email@example.com to obtain the appropriate CALI code.
You can download free versions of the Federal Rules of Civil Procedure and other rules which will work on your Ipad or Kindle from CALI's eLangdell Bookstore. Note: compare the dates of the rules available at the CALI site to the dates of the current rules available at the Rules and Policies section of the United States Courts website.