do not get grown bunny without knowing its exact age.
dont get a single bunny. it will get so lonely it will stop eating and kill itself (this is not a joke)
dont get very puffy bunnies. they get very dirty from dirt etc.
dont leave bunnies inside little plastic cages,they will get depressed.
here is what you SHOULD do:
get 2 bunnies that dont feed from their mother anymore
make sure they are both female. male bunnies will fight and different sexes will lets say "multiply"
get a proper cage with wood inside of it so they can use their teeth and nails on it and 1 meter squared for each bunnie
and remember WHY you want a bunny. if you think you want them because they are cute, remember everything is cute for the 3 months but later bothersome