Choose an undergraduate course of study that you have an interest in. Focus on your undergraduate studies--your undergraduate GPA will have a significant influence over your law school admission.
Plan to study for the LSAT far in advance. Sign up for an LSAT study course or purchase a preparatory book. Study all three sections--reading comprehension, logical reasoning and analytical reasoning--equally at first and then focus in on the areas with which you have more trouble. Block out a significant amount of time to study--at minimum a month, but it can't hurt to take as much time as you can afford to prepare for this very important assessment.
Invest time in developing an area of interest that could become your focus as a law student. Interview lawyers currently working in areas in which you have an interest. Volunteer at your university or in your community--this will show you are a well-rounded individual.
Research law schools. Base your decision on where to apply on your LSAT score--law school admission statistics are available online. Apply to schools that have strong programs in the areas of law in which you are interested. Consider location when selecting law schools. Many people work in the same state in which they acquired their J.D. degree.
Seek out internships once you are in law school--this will win you contacts and give you further insight into navigating the world of law practice. Develop relationships with your professors as they often have connections that may help you along your way. Apply yourself to the study of law fully--law school class ranking is a factor that future employers take into consideration.