First decision is deciding if your bunny will live indoors or outdoors. Will they stay outdoors all year round or come in during the winter? Will you have a way to keep them cool or warm enough with this situation? Will they have access to move around to exercise? Will they be safe from predators or other household pets? After you have this answer, it is time to start shopping :)
You will need:
A safe cage
A water bottle or water dish to drink out of
A hay/pellet feeder
Bedding for the cage floor
Alfalfa hay and pellets
Toys to chew on
Nail clippers
Styptic in case you cut too short
Brush for grooming
Pet carrier for brining home and vet visits
Name of Vets in your area that are specialized in Rabbit care
Things you may want:
Litter box and litter (if you choose to potty train)