Do I allow two mealies to grow to beetles? If so, how do I know I have a male and female? Is there a site that has all of the fundamentals on raising mealies?
Males and females are supposed to be different sizes. You may as well try to get more than 2 beetles. There's no way to know for sure if they are male or female and you need a bunch of beetles to make a reasonable number of worms. If you google "mealworm care" I'm sure you'll find some websites (or else do a search on the froums).