you need many chests, a mullb tree, and a couldron.
catch a male and a famle silk moth.
but them together in 1inventory.
they will produce 6 or 8 eggs (i forgot).
putt this eggs on a herb table. they will hatch to silkworms.
now you have to feed them. every worm eat 1mulb leaf every 12h.
the worms have to 4times a leaf. after that they got cocoons.
you can wind it out by using a couldron. if you are full nature you will get to silk filament. not full nature = only 1 filmanet. 10filmants = 1silk thread. 10threds = 1silk cloth.
you can put 7worm's into 1chest, fill that chest up with mulb leaf's and every worm is able to eat 4leafs in 48h. so you dont need to spend attention to this.
hope you understand it
gl