Oh my! Propagating succulents is so much fun! :D Your babies look amazing and they will be super happy on that window there. Just give the lots of light! You started them in water? I normally just put the cutting directly in soil and never had any problem with them. I find Jade super easy to propagate.

I don't think they will need lots of fertilizing. Maybe once a year in spring when they start growing. They need lots of light, and not too much water - they are succulents.

Also if you have the space, put them outside in a garden or patio in the warm months. They will love it. And you can keep them out until fall. Hide before frosts come.