If your planter is going to live outside all year round, drill holes in the bottom for drainage. Drowning my plants is something I do regularly, and I’ve learned the hard way to DRILL HOLES.
The nursery where I love to get my perennials each year has a whole section of tiny succulents at the back, for 4$ per plant. The aren’t marked with a name tho… so I just choose things I think are beautiful!
I started adding the “fairy garden” part of this succulent fairy garden by fiddling with where the fairy house should sit (I used a concrete fairy house with a simple polymer clay door for this garden).