I would go with a rescue first, but if there aren't any available definitely go with a young'un. Depending on what breed you pick they can live to 10 years. But if you do go with a younger rabbit definitely get him/her spayed and neutered; females need it otherwise they get ovarian cancer around 5 years and boys calm down and become easier to train.
oh tons! lol. First make sure you take them to the vet, try to find one that specializes in bunnies. They'll need their teeth checked along with possible spay/neutered. They can be very lovable when worked with enough, but expect the cold shoulder at first. Be prepared for them to basically act like a cat; "you can pet me when it fits in my schedule". It's supper easy to make them treats with the leftover dust in the hay bags. Play pens are great! Not only do you get to play with your bunny but its time out of their pen for exercise. Depending on how comfortable they get with you guys, you can also get a harness for him/her and take them outside on a leash. They don't "walk" on a leash its more you just follow them around. Laki is also a bunny owner on here. She helped me get things figured out for this little guy.