I got Theo when I was your age! In my opinion, it is the best age to get a rabbit. I'm guessing you are buying from Chewy because of the AutoShip? I suggest getting this hay if that is the case:
Standlee Premium Timothy Grass Grab & Go Compressed Bale Forage Horse Feed, 50-lb bale - Chewy.com. It lasts Theo (who is a mini rex and very close weight to a holland lop) 8 months, and it is only $25! It is so much cheaper than buying small bags. Even though it is for horses, it is completely safe for rabbits.
I'm not sure if you are planning on housing her inside or outside, but I suggest
litter training her. It makes clean so easy! Of course, she will need to be spayed if not yet because it will help with litter training, and prevent cancer. For indoor housing ideas check out these links:
https://www.rabbitsonline.net/threads/2020-indoor-cages-add-your-photo.96731/https://www.rabbitsonline.net/threads/2019-cages-add-your-photo.93422/I'm also not sure what her diet will look like once you get her but here is a link that should help:
Feeding.
Make sure you post a thread on the "Rabbit Registry" forum with pictures when you get her! We love pictures here!