yay for the mulberry trees!!! be prepared to collect lots of small branches...... these guys can REALLY eat. The more they eat, the faster and larger they grow. last summer i started with 250 eggs and had silks all summer long----i collected from 3 different trees-----BIG trees.
how many beardies are you planning on feeding?
when i start with eggs i use an incubator and keep them at a set temp of 85--------they are weeeee little things when they hatch----black in color---look smaller than rice. if you feed leaves you MUST feed hatchlings the youngest, tenderest leaf you can find. they have teeenie-tiny jaws and cannot break down the older adult leaves. OR you can use chow-------you can either buy it pre-made or buy dry ingredients and make it yourself. it's easy to make. i use a butter knife to slice off bits of chow to feed-----i always sterilize the knife with alcohol---for some reason alcohol does not seem to harm them.
they MUST be kept as dry as possible------any kind of moisture can produce bacteria/mold which is lethal to silks. you never want to really handle them either as their skin is ~very~ delicate and can bruise easily-----thus, causing bacterial infections which spread like wildfire to all the others. if you take one out to feed to a beardie and it doesn't eat it you don't want to put it back in with the others.
i would recommend starting with a batch of 100 small worms or so to help you learn about what to expect.
i don't keep silks in the winter because the chow is too expensive and like i've said they will amaze you w how much they can eat..... i don't know of any way to keep mulberry leaves------i think there was a recipe going around about how to dry them an pound them into to powder to make chow. ????? i dunno.
i hope i've answered your questions------lemme know if you have any more. silkworms are really awesome to care for-----going though all their cycles is very cool.
post some pic of your enclosure!
good luck!