The deserttropicals.com has some info on care and cultivation. I don't know if the second is the crassula lycopodioides. It is too hard to tell in the picture without an upclose clear picture of leaf sets. You might want to take another picture using the closeup setting if you have one. Then you could get a better id.

And I forgot to mention this plant does not appear to have high light requirements, when I first got it I placed it in a shaded south window when I checked on it a few days later it was almost completely brown. Now it is a distance away from a window under uv light and it seems to have regained all but a little of its color. I also sent a nether pic if it helps...

second photo looks like Aloe prostrata (syn. Lomatophyllum prostratum). Last photo with your finger looks like some type of Aeonium in center and perhaps small pups of cryptanthus

water needs vary hugely depending on a host of variables including pot type, pot size, growing medium, air temperature, relative humidity, growth cycle, sun exposure, season, etc. Most Echeverias need to be watered only when the soil is almost none dry if the plant is dormant (summer and winter for most species), and only when the soil is barely moist if it is actively growing (usually spring and fall if temperatures are right). To further complicate things,,not all Echeverias tolerate the same treatment. I have several community pots, and I'm forever rearranging them because one or two species in the pit would prefer to be drier or wetter than the rest. I don't know that Garret isn't correct about your Echeveria cultivar. He probably is. Black Prince does have points on the ends of the leaves, and despite the lack of sunlight, yours seems to have a darkish hue that might turn almost black with enough sunshine. If yours were growing in enough sun, it would have a more recognizable appearance- and would be easier to ID.