Aw she's adorable!
Well make sure she has all her necessitates. Water, hay, pellets, something soft to lie on, and a litter box. she will need things to play with and to chew on. I would say after you bring her home give her some time to adjust without to much handling. Some rabbits take longer than others but She will adjust to her new home in time.
As for her happiness, all rabbits have different temperaments and you will have to learn what her moods are. I think though if you see her binky or if she gives you kisses that's generally a good sign.
I'm sure someone with experience will be along soon!