Congratz on finally getting a kitty!
Yep, if you can wait to get her that would be wonderful. Have you ever heard the saying: some things are worth the wait ?? I think that applies to this.
If you can, buy a nice soft blanket for your kitty, and giveit to t he breeder (not sure if its a breeder or not but..) for your cat. If the mama cats sent an the the other babies scent geets on there, it will be easier for her because it will smell like home. My friends did that for their kitten and it made the transition from the two houses much easier.
For supplies I would get:
-A litter box (I would also get airfreshners, because even if you clean yours everyday, it is gonna have a odor, i just put them by the box, and then it smells better.THe ones with the covers are nice, but some cats won't use them, I know Keisha wouldn't likeit.)
-Food (make sure its kitten food)
-A bed (some ca ts dont sleep on them, but if you encourage it when shes a kitten she might. still its a good thing to have. if y ou dont wnat to buy one a box o r laundry basket with blankets in it would work nicely)
-Food and Water dishes
-Toys -kittens LOVE toys-
-Cat scratcher (this really helps so she doesn't get your furniture)
Their is so much more stuff you can get for her, but thats basically the nesities there. So good luck!