Well, first it's a lager so it needs to be fermented at 50 degrees F, and then stored at 34 degrees F for about 8 weeks. Lagers are tricky if you don't have good temperature control.
Because many light lagers use adjuncts like flaked corn or rice, I've never seen a good one starting with a kit extract so I don't think I could give you a recipe that would work with extract but you may be able to find one on the internet.
This is this thread, but I've never tried this recipe:
http://www.homebrewtalk.com/f58/something-like-stella-108648/