Taking up their free offer you is probably the better bet. Read the offer here.
http://www.learningstrategies.com/Paraliminal/Intro2.html If you're stuck for ideas which ones to start off with. A good all rounder is the Prosperity tape. You can adapt that to just about any life situation. EG delevoping a more prosperous attitude to study, good health, more prosperous relationships. Personal Genius is great for improving your study skills and in some ways enhances your self esteem. Memory Supercharger comes with the Photoreading home course and is a valuable tape for studying. (play it the night before a test). New Behaviour Generator is well worth having handy as is Anxiety Free. Each Paraliminal has a detailed page explaining how they are usually used.
If after viewing the pages you are still unsure what your best starting point is for your personal goals. Write down what you would like the paraliminals to help you achieve. Post here for suggestions which paraliminals will get you started or contact LSC they will definately be able to suggest where to start. 
Writing it down what you want to have the paraliminals help you to achieve in the order of priority before you go throught the list of paraliminals will probably help you to narrow down which tapes you would like to use too.
Alex
