Once you have a sculpt, and it is baked, you add layers of silicone over it making sure to get into all the nooks and crannies, after multiple layers you let it dry (that is the glove mold).
Then you make the mother mold of a harder material such as plaster that will support the glove mold once the clay sculpt is removed.
Once that is dry you have to open it back up, remove it from the glove mold (silicone layers), then get your sculpt out of the glove mold. remove all the pieces of clay and wash the glove mold. Apply release agent inside. Then put it back into the mother mold and fasten it closed tightly.
Then you pour your silicone into the spout of the mother mold and glove mold. Once that has set you then remove your mother mold, then remove your now silicone baby/sculpt from your glove mold kinda like peeling it off (sometimes) Then you have your silicone project (blank) ready to be washed and prepped for painting. Which is more silicone and pigments normally.
Youtube has some cool videos of the process.
Here is a google image to kinda understand what the glove mold is. But once for silicone babies are mush more intensive.