Oh it’s so itty bitty! I can understand why you’re excited! Are you allowed to visit it over the coming weeks?
Have you looked through the BUNNY INFO tab here in Binky Bunny? That’s a good guide for housing, diet etc. Some of the diet recommendations are to do with age and weight rather then type of breed. It’s a good idea to get some of the food that it has been eating when you pick it up to take home. Most responsible breeders will provide this anyway. Then, if you would like to change the type of pellet feed, you can do it slowly, mixing the old and the new so the rabbit adjusts.
For a cage, I would try get the largest you can afford. Even though hollond lops are a small rabbit, they still need room. Especially for those times when you may have to keep them caged longer then usual, like when they go through puberty. Sometimes in this phase, they need to relearn how to use the litterbox and you have to confine them longer. Later, you can add a pen to the cage or rabbit proof a room and leave the cage door open. The cage can then become it’s “home base” and safe place. A lot of cages are sold as a kit, with bedding, litterbox, waterbottles etc. You don’t need to buy bedding, just get some litter for the box only. Often the litter boxes are far to small and a little corner style box. (Okay for when the rabbit is a baby). So I would pick up an inexpensive rectangular cat litter box also. Don’t be surprised if your rabbit chooses one as a bed.
With water bottles, find out what the bunny has been used to drinking out of. If you prefer a bottle, it shouldn’t take it long to learn to use it if unaccustomed to them.
Keep us updated for when you bring this beauty home!