The basics of what you need are:
Rabbit food (pellets not muesli)
Good quality hay (you may need to buy this online to get decent quality)
Litter (you can use newspaper and hay, wood pellet litter or paper-based litter, nothing clumping or clay-based)
a heavy ceramic water bowl
a small non-tip style food bowl
a hidey-hole - I use their vet carrier with a blanket inside
a large litter tray (32l+ underbed storage boxes are best)
a hoover that can cope with hay - I'd recommend a Henry
a carrier for vet trips
Everything else is optional really. Tunnels and different levels are great fun for rabbits and willow/wicker balls are generally well-received. If the room is going to be one that you use too, you'll need to block off or protect any cables and remove any house-plants, scented candles or air fresheners as they are a health risk.
I think it's important to recognise that rabbits aren't easy pets to house-train, as you can't train them as such, they don't understand being told off for an action, they don't want to please you like a dog does. Because of this, territorial marking, digging and chewing are all natural behaviours that you can't stop them doing, you just have to try and direct them in a suitable way, e.g. a rabbit with a lot of space and enrichment activities is less likely to be destructive. Most neutered rabbits are fairly easy to litter train (they naturally choose a spot to wee in) but most will still poo around the room, and all house-rabbit owners are familiar with having hay everywhere - they are not pets for house-proud people and you will need to hoover a couple of times a day minimum if you want things tidy. You will have to adapt your home to having a house-rabbit, they are rewarding pets but won't just slot in like a cat or dog would.
A lot of it comes down to the luck of the draw in how good they are in the home- personality plays a big part. Some rabbits just seem to want to destroy everything and wee everywhere and there's nothing you can do about it, whilst some are well behaved. I would recommend looking at rescue rabbits that are already neutered and adult, as this will give you the best chance of being able to choose a well-behaved one. Avoid baby rabbits as destructive behaviour and litter training usually only sets in when they get to puberty/adulthood.