We had rabbits for 7 years.
First - ideally you shouldn't have just one, you should keep them in pairs. Both sexes have to be neutered, even if living alone. If it is female, the biggest killer in female rabbits is cancer and neutering can solve this.
They need vaccinations, nowadays it's a 3-in-1 and can be done just once a year.
You need pet insurance which can be expensive and even that often doesn't cover issues with teeth, another common problem with rabbits. And vet bills are expensive.
They eat predominary hay plus dry food in pellets (not muesli) and some fresh food. Carrots are actually too sweet for feeding often and lettuce is like eating water. Mine loved kale, broccoli, peppers (again not a lot, too sweet), some lettuce, pak choi, fresh herbs like parsely in moderation, rasberry leaves, dandolion and lots more you can find on the RWA website.
You need a bigger hutch you think you need and it needs a permanently attached run for them to be active. A shed is ideal but they are good hutch/run combinations available. Think of at least 1.8m length. It needs to be properly wind, rain and sun proof. You should also have a run for the garden but unless you dig this deep you can't keep them there overnight.
They need to be cleaned out daily .
You need to have either a very willing friend or pay for a rabbit hotel for the holidays, they can't be left alone.
They hate being handled by young children, they are not child-friendly pets.
We lost our last one last Summer, while I am glad in some cases that the expenses, time and responsiblities are gone, I do miss them.