If you had the money, I would recommend something like a purpose built indoor enclosure. I can't seem to work out photos on here any more, but this is the type I mean:
https://www.manorpethousing.co.uk/indoor-enclosures-rabbit-housing. They look nicer than some others, but also avoid the madness that can come from bunnies chewing on metal bars every time they want something! I have one like those in the web link, with lino underneath for the floor (though you might not need that if you have hard floors anyway).
I would get a large tray for the litter - something like an underbed storage tray, and then keep them in the enclosure with that tray - I think you will find that they will start to use it like a litter tray just with it being there. Then you can gradually increase their space - letting them out for short periods while you watch them and so on. I started like that and now the bunnies have the total run of my flat 24-7, though occasionally I close off my bedroom with a baby gate that's permanently in the doorway, since one of mine goes through phases of making holes in my pillows!
They can be destructive, but I have always been in rented accommodation with house bunnies, and have only had one major issue, when a giant bunny I had got behind the bed and chewed a hole in the carpet without my knowledge - eek! You'll never get the bunny proofing right first time, and will have to do some tweaks as you go, but I wouldn't go back to having outdoor bunnies now, as there's nothing quite like a bunny 'helper' around the house! :lol: :roll:
My current two absolutely hate hard floors - as in, not carpeted - and I have not managed to get them used to it. Not a problem for me as I have mostly carpet, but you might want to think about getting some rugs around the place.
Good luck, and I hope you enjoy the house bunny experience if you go ahead