There is a wide array of commercial information marketed to pre-law students, and much of it is very good. However, the best resources available to you are the American Bar Association (ABA) and the Law School Admissions Council (LSAC). Both of these organizations maintain comprehensive websites with reliable information on preparing for law school, getting into law school, and choosing the best school for you. Links to their websites are listed below.
ABA Section of Legal Education & Admissions to the Bar: http://www.abanet.org/legaled/home
LSAC: http://www.lsac.org
Another valuable resource is the ABA-LSAC Official Guide to ABA-Approved Law Schools. This book is updated yearly, and provides a wealth of information on each law school approved by the American Bar Association. It is available in print at most commercial bookstores, and is also available online, in a searchable format, at the LSAC website. You may access the online guide at http://officialguide.lsac.org/docs/cgi-bin/home.asp