Without flowers to help narrowing down, I could only guessing for now. Both of the top two plants might be cultivars in the Echeveria genus? The middle plant maybe something in the Echeverua gibbiflora species? Sorry I can’t tell which one yours is. The bottom -plant could be in the Echeveria genus as well, but it also looks like another succulent species; the Kalanchoe luciae? But this is only a speculation. Flowers could help quickly with ID. When it blooms and you still don’t know please resubmit with flowers photo. The included link below is for one of the cultivar, the growing culture for Escheveria is also in the link. Best wishes! https://www.smgrowers.com/products/plants/plantdisplay.asp?plant_id=4250