You probably already know this, but your plants are stretching (etiolated) because they need more light. The babies are already showing signs of etiolation. The rosettes should be more compact with the leaves closer together. Indoors, a south facing window is your best. It looks like you have a plant growing from the stem already (second picture). I would cut the plant above that little plantlet and give it time to get larger. Don't water the top cut rosette until it has roots. Without roots it cannot take up water and may rot. You can mist the leaves and top if they look like they are drying out. I usually mist my leaf plantlets so I don't knock off the roots with a stream of water. Just my preference. You might want to take this opportunity to improve the soil drainage. You can add perlite to the C&S mix you are using so it drains faster. You will end up with a lot of plants from your cutting, the stem and the leaves! Have fun watching the progress.

Ezra I don't think the light will be enough for just about all succulents. Senecio is just OK, it should be little more compact. Another problem in the long run would be humidity that is always higher in bathrooms - succulents are used to much drier conditions and wither in high humidity. Sanseveria may tolerate low light...or maybe you should use non-succulent plants?

WJ I use mix of only grit+perlite+turface. You could add some small bark -I couldn't find it easily, so I am not using it. I add less turface, (no more than 20% of total volume) since it is more water retaining, but you should experiment to see what works in your climate - if very hot, you may want more retention. You probably could control temperatures indoors? The size of particles should be quite similar. I screen perlite and turface to get rid of smallest particles, and I rinse grit as there is always some dust. Here is the photo of grit - that size is quite good & I try to get same in turface and perlite:Some ppl use mix of soil + perlite, or soil + pumice (in about equal amount or less soil) - I do not, so can't advise. You could grow succulents in just grit, or just pumice, or in many mixtures of different substrates. Depends on what you can get easily, how much effort you want to put into sourcing the stuff and mixing it, and also on your growing environment. I prefer not using any organic component like soil or bark, mix drains very well. That doesn't mean they can't be used!:). Depending on material you use, get appropriate drill bits - what bikerdoc and Crenda pictured works very well on glazed pots, ceramic, concrete. Besides those, I also have these:I usually insert piece of wood inside of pot to be drilled for support, so there is even less chance of pot cracking. Don't forget to provide more light. Almost all succulents need lots of it to grow well.

The stubs on your cuttings don't looks so good. They don't look good probably because you've been watering the soil causing the ends to rot a bit. I'd recut the ends to remove the rotten bits and let them callous again. That takes some time- a couple days, I think. Then, as Matt mentioned, let them sit in dry soil. Eventually they should regrow roots without being watered.