Welcome to the world of bunnies! 
I would definitely check out the links Sarita posted, and also check out all of the info on http://www.rabbit.org. That’s the House Rabbit Society website and is full of great info. Also follow MoxieMeadows‘s checklist! Note that the enclosure you end up getting should be at least 12 sq feet, vertical or horizontal, and be at least as twice as tall as the bunny when the bunny is standing. There are a variety of enclosure options you can look into: NIC condos are great, as are the very common x-pen set-ups. Some standard cages can be used, but they are only recommended as nighttime “bedrooms” as opposed to 24/7 living quarters because they are too small for that — it is also recommended that if you go this route to get a dog crate instead of the “rabbit cages” they sell in pet stores.
If you do end up getting a cage like this, it must be supplemented with at least 5 hours of “out time” a day, or be free-roaming, or must be attached to an x-pen or NIC condo set-up or some other kind of spacious set-up. Rabbits need their exercise! 
Definitely consider getting her spayed when she reaches 5-6 months old. It will greatly reduce the risk of her getting reproductive cancers and will greatly improve her behavior, including litter training! The sooner you do it (around 5 months, NOT before), the less hormones will be in her system and the better it will be.
Some other important little things to think about:
- Because she’s 9 weeks old, she’s still in the phase of her diet where she needs unlimited Timothy hay and Timothy hay pellets. I’ll reiterate that the pellets you should buy should be free of any extra bits and bobs — you want straight, 100% Timothy hay. One of the best, most trusted brands of this is Oxbow.
- Make sure that wherever she’ll be roaming is “bunny-proofed”. Click here to read about how to do this.
- Make sure she’ll have constant access to fresh, clean, cold/cool water.
- Litter training info can be found here.
And, of course, stick around these forums!
You’ll learn all you need to know!