I think most members here will tell you spaying and neutering is absolutely necessary. Not only will your bunny be happier, more well behaved, and have better litter habits, it cuts out the possibility of reproductive cancers. Females have an 85% chance of getting uterine cancer before the age of 3, so spaying can extend a female bunny’s life by 7+ years! Also, having fixed buns allows you to have more than one and provide your bunny with a friend – unfixed rabbits can’t be bonded as they are too territorial.
What would you like to know about litter training? I’ll run down the most important points.
1) Make sure your litter box is big enough. You bun should be able to sit in it, turn around, lay down, etc with lots of extra room. Bunnies don’t like it when their bathroom is too small. I’d recommend a cat sized litter box.
2) Only put bedding in the litter box. If there is additional bedding in the cage the bun will probably be confused about where he should pee. Blankets or towels in the cage are fine, but I would stay away from anything that looks like litter (shavings, etc).
3) Put hay in the litter box. Buns love to eat and poo at the same time.
For outside – I personally wouldn’t do it. There really isn’t any need for our domestic rabbits to go outside and it exposes them to predators, fleas, mites, etc. You can set up a safe pen and take your bunny out for supervised trips, but I wouldn’t recommend moving him out there permanently. Besides, they’re so much fun to have in the house where you can watch them and get to know them. I think most bunnies would be pretty bored sitting outside alone all day and night. Also, buns don’t deal with heat well – anything over 80 is uncomfortable and potentially deadly, so keeping a bun outside in the summer can be risky.