I haven't grown it in my house, but I do have one in my greenhouse. Normally dracaena's can lose their bottom leaves. They do that and then grow new ones. If I see a yellowing leaf, I pull it off to keep it looking nice.
I would keep it moist and never let it try out too much. Don't keep it sopping wet though! They love high humidity. Keep a spray bottle nearby and give it a mist a few times a day. They like their temps to be between 60 to 80F.
They like bright light but no direct sun.
Make sure the soil mix is fast draining. I usually would re-pot it every 2 to 3 years.
Feed every four weeks from April until September using a 10-10-10 diluted liquid fertilizer
I'm sure your new houseplants look great! Plants really make a home in my opinion.