Before buying more actual food, you should focus on just storage, as the food you want will depend on the age of your rabbit. I hope you plan to adopt at a rescue! Then you can visit many and give a great rabbit a home.
You can just keep the pellets and hay in the bag they come in. I suggest a hay box, where you can cycle and combine old and new hay so hay won’t go to waste. It can just be a semi large cardboard box. Mine is a plastic container with holes on top to help ventilation. You don’t want moisture to hit the hay.
Also, I suggest buying a set of towels and a laundry bag (cloth diaper Landry bag) so you have designated materials for cleaning and putting dirty rabbit towels. I think this is much more economic and environmentally friendly than going through paper towels.
The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.