Posted By:
Jim VBSean,
Here's my suggestion to a 12 year old. Look to get one card from every set you can. This will expose you to a much wider variety of cards. As you grow the collection, and get a little older, with a little more money, you may find one set that you like the most.
Trying to be a set collector, on a limited budget can be very frustrating as there is almost always several expensive cards in vintage sets.