Honestly, I wouldn't study the openings too much in terms of memorising lines. The chances of you and your opponent following an opening 15 moves in is quite remote. I would look into the main ideas behind the different openings and maybe the first few moves, but I'd focus more on chess opening principles - get your pieces developed, control the center, keep your pieces safe, keep your pieces active, etc. Openings won't win you a game - proper chess playing wins you the game. You'll get more from developing your thought processes in the opening:
-What did my opponent's last move do? What lines are now open for him? What squares are no longer safe (attackers vs defenders)? If my opponent could make a free move, what would he do? How can I meet the threats he created? What squares are unsafe for my opponent? What lines do I have open? What threats can I create for him? What pieces of mine are inactive? What move is the best way to meet all of these issues I'm thinking about?
Now, as for learning some basic ideas behind some of the openings, check out www.thechesswebsite.com for some introductory videos.
let me have 'em.. a little description as to why a particular opening should be studied would be great