First of all, pat yourself on your back for thinking ahead like this. Many people look at the Engineer in Training exam as an test that is near impossible to pass. Going in to the exam and your studies with this positive attitude is definitely setting you up on the right path to conquer the exam without looking back. Once you pass the EIT exam, you will be designated an Engineer in Training (EIT), or Engineering Intern (EI), each term means the same thing. You are commonly allowed to put the initials at the end of your name which is kind of a cool. At this time, you begin to acquire acceptable work experience towards your PE license while working under, in most cases, the supervision of a registered Professional Engineer. The experience required to apply for your PE license is typically a minimum of 4 years but differs from state to state and in some cases dependent on the accreditation of the program you graduated from.
I have an area on this site dedicated to State specific requirements that you can reference for further details.