Reddit reviews House Rabbit Handbook: How to Live with an Urban Rabbit

Aww, how awesome of you for taking in a probably-abandoned bun (there are unfortunately many post-Easter throwaways). I've got two adopted rabbits myself.

Judging from the utter lack of a dewlap, I'd guess it's a boy. First and foremost, do you have a litterbox for him yet? Rabbits are easily litter-box trained. You should get him one and put in some wood pellets (the kind they sell in feed stores for horse stables -- super cheap) or recycled paper pellets (like Yesterday's News) and a big handful of good quality hay.

Someone posted a link to the House Rabbit Society's website already, which is a really good resource. I'd also recommend this if you can get your hands on it somewhere. Also, if you have any questions on rabbit care, feel free to PM me.