I forgot the rest of your questions. Propagate several ways. Most common is leafy cuttings stuck in perlite, place in bright location but not direct sun. Keep perlite damp but not soaked. It helps if you screen the perlite through a 'regular sizer' kitchen strainer to remove the fines - or, cut 2-3 inch chunks of stem & press part way into a fast-draining medium. They should look like logs floating on the water - half submerged. Tent loosely & forget until they're pushing foliage, then remove tenting gradually. You can do it in Tupperware or a margarine tub with the lid slightly ajar for a little air movement. Again - damp, not soggy, is key. There are a number of reasons it might be dropping leaves. Too wet, too dry, too high a level of soluble salts in the soil (all probably related to soil choice & watering habits) or a sudden decrease in photo-intensity. Al

I see you're new here, welcome. Pls. do some reading around here on mixes. While it's good that you're already using Cactus & Succulent mix (C&S for short), you will quickly see that many if not most of us here have learned to amend our C&S mixes (w/perlite or pumice, at least 30% or 50% to be safest), 'cause these days, commercial mixes have too much peat in them (kills out plants) &/or include wetting agents to retain water (also kills our plants). Others of us on here use mixes you'll see mentioned as Gritty Mix or variations of 5:1:1, things like that, which over time folks have learned worked well for them. Also some of these pre-made mixes contain fertilizer as well, which many of us wish to control ourselves rather than someone unfamiliar w/ our growing conditions. There are lots of opinions on mixes, but key & accepted by all of us is that to grow C&S, we need fast draining mix & what you've pictured above doesn't look like that. So that's an improvement that could be made easily & help the plants more that almost anything else one could try.

i am the worst at identification (this looks like an echeveria i have, but I honestly dk), but i can tell you that this guy needs more sun-- he's showing early signs of stretching out. There are a million boards on this site that can tell you what kind of soil succulents like, but in my experience-- make sure your soil isn't too water-retentive, water when leaves lose turgidity, give him lots of light, and your plant should turn out okay! c:

Botanical name of money tree is Pachira aquatica, with the aquatica referring to it's need for damp conditions. Did you remove the old, mushy companions in conjunction with repotting? I don't see any stumps. For putting outside, I'd use a much bigger pot for that size plant, so it doesn't blow around. A clay pot would help add weight to the base and keep the center of gravity lower. Your soil looks like it has plenty of perlite in it so you should be able to keep it moist without risking rotting the roots (overwatering.) Dieffenbachias don't mind a longer interval between waterings.