Heres a quick link to one of the better waxworm caresheets out there. I do exactly as this guy says, apart from I sprinkle a little bit of bee pollen (available online or at the odd health food store) in there too for added nutritional value.
From 1 tub of waxworms, I get hundreds and hundreds of the little blighters, of all shapes and sizes. Anyway, enough of me, heres the guide:
www.exotic-pets.eu/waxworms.php