Start here
https://binkybunny.com/BUNNYINFO/tabid/53/Default.aspx

Thanks for that link, Tate.
Lizzy, if you have any questions that are still not addressed by the sections of info. via the link Tate posted (I activated it so you just need to click it) then feel free to ask them here.

First suggestion though: put a spare litter pan inside and show it to your bunny, with a couple of poos of his already in it so he smells them and knows it’s a box for him. Many bunnies do not know how to make their way all the way back to their cage, so have little accidents. He needs an inside litter spot to go to when it’s time. Try putting it in a quiet, private corner of the room so he will feel safe.

neutering also helps with the litter training

An x-pen inside can help too, to get him adjusted to being inside and you can put a floor down for easy clean up until he’s litter trained fully. And you could test his inside manners in a secure environment.

I would read all the house training info carefully- and you are probably going to have to get him used to a small area with something on the floor that can be cleaned if needed. Too much space at once equals – pee and poo on the floor. If he is not neutered yet- I would get him neutered first. have you looked at the indoor habitats that are possible- will you be able to switch him to an indoor bunny and then work on free run of a room? Expecting that a bunny, especially a young or not fixed bunny to come in and hop around and enjoy the freedom with no accidents is a recipe for failure. It is a slow, steady process. And since it sounds like you have a parent involved in the situation- I would recommend the slower the better. Start with a pen or condo in the house- and gradually increase the area allowed. Too much too fast might very well cause a parent to lay down the law- no roaming bunnies. I am an adult and have faced frustration with my bunnies until they matured mentally and physically got over hormones by fixing them and settled to the environment.

Katnip makes a good point about staying on the good side of parents for long-term success with bunnies. I didn’t get at first that you are talking about going free range inside right away. I really strongly recommend a designated area with a containing xpen or cage for the bunny initially as well. Bunnies actually don’t view a cage or habitat as a “cage” like we would. They consider them like a safe burrow, where they can rest, sleep, eat and relax completely free from fear of predators, so security is important to them. An enclosure, believe it or not, provides that for them. So a choice between being outside or free range, or inside and “confined” is actually not a problem for the bunny trying the latter. You can then let a young bunny out in stages, supervised, in certain parts of your home while blocking off others. (Using closed doors to rooms, or baby gates.) Many bunnies plot out their favorite rooms and just stay there, never venturing into other spaces, but it’s best if you set their limits first.

Yes, you have to start in a small space. Not all rabbits can successfully be allowed unsupervised free roam, so it’s incredibly important that you have a cage like an xpen for him to live in. I wouldn’t recommend he EVER be 24/7 free roam, at least not while you live at home. The truth is, it’s NOT your house. And you need to be respectful of your parents. Definitely bring him inside permanently, but have a safe pen or condo for him and allow him supervised exercise time.