The first step everyone should take when starting a project - gather your supplies.
There are a few things to keep in mind when you choose your materials. The chain should be able to fit through the hole in the bottom of your pots. The pots can't be too heavy when they are filled and hanging, or they will potentially break and y'all will have a big ol' mess to clean up! You should also make sure the number of pots you get can fit on the amount of chain you have.
Trailing plants like vines would make a good plant on the bottom pot. Flowers can be used in the middle and upper ones. Keep in mind you dont have to choose just ornamental plants and flowers. You could also choose herbs such as lemon balm, mint, basil, etc. to be enjoyed in salads and teas or even used for medicinal purposes.