Let me predicate my post by saying that Market/Message/Media is a living thing, and over time you get more clear in the definition of your Market, better and more clear in delivering Message, and by process of elimination find the best Media. That being said, there isn't a "right" answer persay.

Off the cuff I'd say your looking for a male, age 16-22, primary occupation is student, lives in a rental, plays or reads fantasy books and games like Magic/D&D/Yugi-Oh, and has conveniant internet access. It might be a good idea to put some geographic criteria in here as well, that makes things a lot simpler. You might try to figure out what type of area are you pulling the most good players out of now? Like, are people in metropolitan cities playing CF because they can stay at home and do something sophisticated, or are people from BFE more likely to play because there is nothing else to do? This is is where market research comes in. The more laser focused you can get your market, the better. (I know you guys have done some polls about these kinds of things, if you want to post the results of polls I can analyze the data real quick and tell you what other polls you need to run in order to fill in the gaps.)

Almost as important as knowing who your Market is, is knowing who your Market is not. There are some Messages, and lots and lots of Media that just aren't going to touch this Market. For instance, this guy is not reading his local newspaper, so don't bother with putting things in places where he's not going to see them.