Crafting isn't really viable for new lights. Honestly I'd just farm for decent legendary rolls if I where in your shoes. Crafting is really for the seasoned guardian who's got a few resources to spare. Funny thing is once you've gone and farmed a few games of dares/strikes/nightfalls etc you'll find you have build up enough resources to start crafting but by then you might have found a few decent legendaries with good/god rolls to mean you might not need to craft a weapon any way